I have the free version running so there's no support.
With build 8972 was the issue solved that started for me with build 8965.
This is the log of ClamAV after updating to build 8979:
Fri Aug 2 17:19:28 2024 -> +++ Started at Fri Aug 2 17:19:28 2024
Fri Aug 2 17:19:28 2024 -> Received 0 file descriptor(s) from systemd.
Fri Aug 2 17:19:28 2024 -> clamd daemon 1.3.1 (OS: Windows, ARCH: AMD64, CPU: AMD64)
Fri Aug 2 17:19:28 2024 -> Log file size limited to 1048576 bytes.
Fri Aug 2 17:19:28 2024 -> Reading databases from C:\Program Files (x86)\SmarterTools\SmarterMail\Service\Clam\share\clamav
Fri Aug 2 17:19:28 2024 -> Not loading PUA signatures.
Fri Aug 2 17:19:28 2024 -> Bytecode: Security mode set to "TrustSigned".
Fri Aug 2 17:20:04 2024 -> +++ Started at Fri Aug 2 17:20:04 2024
Fri Aug 2 17:20:04 2024 -> Received 0 file descriptor(s) from systemd.
Fri Aug 2 17:20:04 2024 -> clamd daemon 1.3.1 (OS: Windows, ARCH: AMD64, CPU: AMD64)
Fri Aug 2 17:20:04 2024 -> Log file size limited to 1048576 bytes.
Fri Aug 2 17:20:04 2024 -> Reading databases from C:\Program Files (x86)\SmarterTools\SmarterMail\Service\Clam\share\clamav
Fri Aug 2 17:20:04 2024 -> Not loading PUA signatures.
Fri Aug 2 17:20:04 2024 -> Bytecode: Security mode set to "TrustSigned".
Fri Aug 2 17:20:31 2024 -> Loaded 8696843 signatures.
Fri Aug 2 17:20:35 2024 -> +++ Started at Fri Aug 2 17:20:35 2024
Fri Aug 2 17:20:35 2024 -> Received 0 file descriptor(s) from systemd.
Fri Aug 2 17:20:35 2024 -> clamd daemon 1.3.1 (OS: Windows, ARCH: AMD64, CPU: AMD64)
Fri Aug 2 17:20:35 2024 -> Log file size limited to 1048576 bytes.
Fri Aug 2 17:20:35 2024 -> Reading databases from C:\Program Files (x86)\SmarterTools\SmarterMail\Service\Clam\share\clamav
Fri Aug 2 17:20:35 2024 -> Not loading PUA signatures.
Fri Aug 2 17:20:35 2024 -> Bytecode: Security mode set to "TrustSigned".
Fri Aug 2 17:21:05 2024 -> +++ Started at Fri Aug 2 17:21:05 2024
Fri Aug 2 17:21:05 2024 -> Received 0 file descriptor(s) from systemd.
Fri Aug 2 17:21:05 2024 -> clamd daemon 1.3.1 (OS: Windows, ARCH: AMD64, CPU: AMD64)
Fri Aug 2 17:21:05 2024 -> Log file size limited to 1048576 bytes.
Fri Aug 2 17:21:05 2024 -> Reading databases from C:\Program Files (x86)\SmarterTools\SmarterMail\Service\Clam\share\clamav
Fri Aug 2 17:21:05 2024 -> Not loading PUA signatures.
Fri Aug 2 17:21:05 2024 -> Bytecode: Security mode set to "TrustSigned".
Fri Aug 2 17:21:35 2024 -> +++ Started at Fri Aug 2 17:21:35 2024
Fri Aug 2 17:21:35 2024 -> Received 0 file descriptor(s) from systemd.
Fri Aug 2 17:21:35 2024 -> clamd daemon 1.3.1 (OS: Windows, ARCH: AMD64, CPU: AMD64)
Fri Aug 2 17:21:35 2024 -> Log file size limited to 1048576 bytes.
Fri Aug 2 17:21:35 2024 -> Reading databases from C:\Program Files (x86)\SmarterTools\SmarterMail\Service\Clam\share\clamav
Fri Aug 2 17:21:35 2024 -> Not loading PUA signatures.
Fri Aug 2 17:21:35 2024 -> Bytecode: Security mode set to "TrustSigned".
Fri Aug 2 17:22:06 2024 -> +++ Started at Fri Aug 2 17:22:06 2024
Fri Aug 2 17:22:06 2024 -> Received 0 file descriptor(s) from systemd.
Fri Aug 2 17:22:06 2024 -> clamd daemon 1.3.1 (OS: Windows, ARCH: AMD64, CPU: AMD64)
Fri Aug 2 17:22:06 2024 -> Log file size limited to 1048576 bytes.
Fri Aug 2 17:22:06 2024 -> Reading databases from C:\Program Files (x86)\SmarterTools\SmarterMail\Service\Clam\share\clamav
Fri Aug 2 17:22:06 2024 -> Not loading PUA signatures.
Fri Aug 2 17:22:06 2024 -> Bytecode: Security mode set to "TrustSigned".
Fri Aug 2 17:22:36 2024 -> +++ Started at Fri Aug 2 17:22:36 2024
Fri Aug 2 17:22:36 2024 -> Received 0 file descriptor(s) from systemd.
Fri Aug 2 17:22:36 2024 -> clamd daemon 1.3.1 (OS: Windows, ARCH: AMD64, CPU: AMD64)
Fri Aug 2 17:22:36 2024 -> Log file size limited to 1048576 bytes.
Fri Aug 2 17:22:36 2024 -> Reading databases from C:\Program Files (x86)\SmarterTools\SmarterMail\Service\Clam\share\clamav
Fri Aug 2 17:22:36 2024 -> Not loading PUA signatures.
Fri Aug 2 17:22:36 2024 -> Bytecode: Security mode set to "TrustSigned".
Fri Aug 2 17:23:07 2024 -> +++ Started at Fri Aug 2 17:23:07 2024
Fri Aug 2 17:23:07 2024 -> Received 0 file descriptor(s) from systemd.
Fri Aug 2 17:23:07 2024 -> clamd daemon 1.3.1 (OS: Windows, ARCH: AMD64, CPU: AMD64)
Fri Aug 2 17:23:07 2024 -> Log file size limited to 1048576 bytes.
Fri Aug 2 17:23:07 2024 -> Reading databases from C:\Program Files (x86)\SmarterTools\SmarterMail\Service\Clam\share\clamav
Fri Aug 2 17:23:07 2024 -> Not loading PUA signatures.
Fri Aug 2 17:23:07 2024 -> Bytecode: Security mode set to "TrustSigned".
Fri Aug 2 17:23:37 2024 -> +++ Started at Fri Aug 2 17:23:37 2024
Fri Aug 2 17:23:37 2024 -> Received 0 file descriptor(s) from systemd.
Fri Aug 2 17:23:37 2024 -> clamd daemon 1.3.1 (OS: Windows, ARCH: AMD64, CPU: AMD64)
Fri Aug 2 17:23:37 2024 -> Log file size limited to 1048576 bytes.
Fri Aug 2 17:23:37 2024 -> Reading databases from C:\Program Files (x86)\SmarterTools\SmarterMail\Service\Clam\share\clamav
Fri Aug 2 17:23:37 2024 -> Not loading PUA signatures.
Fri Aug 2 17:23:37 2024 -> Bytecode: Security mode set to "TrustSigned".
Fri Aug 2 17:24:08 2024 -> +++ Started at Fri Aug 2 17:24:08 2024
Fri Aug 2 17:24:08 2024 -> Received 0 file descriptor(s) from systemd.
Fri Aug 2 17:24:08 2024 -> clamd daemon 1.3.1 (OS: Windows, ARCH: AMD64, CPU: AMD64)
Fri Aug 2 17:24:08 2024 -> Log file size limited to 1048576 bytes.
Fri Aug 2 17:24:08 2024 -> Reading databases from C:\Program Files (x86)\SmarterTools\SmarterMail\Service\Clam\share\clamav
Fri Aug 2 17:24:08 2024 -> Not loading PUA signatures.
Fri Aug 2 17:24:08 2024 -> Bytecode: Security mode set to "TrustSigned".
Fri Aug 2 17:24:38 2024 -> +++ Started at Fri Aug 2 17:24:38 2024
Fri Aug 2 17:24:38 2024 -> Received 0 file descriptor(s) from systemd.
Fri Aug 2 17:24:38 2024 -> clamd daemon 1.3.1 (OS: Windows, ARCH: AMD64, CPU: AMD64)
Fri Aug 2 17:24:38 2024 -> Log file size limited to 1048576 bytes.
Fri Aug 2 17:24:38 2024 -> Reading databases from C:\Program Files (x86)\SmarterTools\SmarterMail\Service\Clam\share\clamav
Fri Aug 2 17:24:38 2024 -> Not loading PUA signatures.
Fri Aug 2 17:24:38 2024 -> Bytecode: Security mode set to "TrustSigned".
Fri Aug 2 17:25:09 2024 -> +++ Started at Fri Aug 2 17:25:09 2024
Fri Aug 2 17:25:09 2024 -> Received 0 file descriptor(s) from systemd.
Fri Aug 2 17:25:09 2024 -> clamd daemon 1.3.1 (OS: Windows, ARCH: AMD64, CPU: AMD64)
Fri Aug 2 17:25:09 2024 -> Log file size limited to 1048576 bytes.
Fri Aug 2 17:25:09 2024 -> Reading databases from C:\Program Files (x86)\SmarterTools\SmarterMail\Service\Clam\share\clamav
Fri Aug 2 17:25:09 2024 -> Not loading PUA signatures.
Fri Aug 2 17:25:09 2024 -> Bytecode: Security mode set to "TrustSigned".
Fri Aug 2 17:25:40 2024 -> +++ Started at Fri Aug 2 17:25:40 2024
Fri Aug 2 17:25:40 2024 -> Received 0 file descriptor(s) from systemd.
Fri Aug 2 17:25:40 2024 -> clamd daemon 1.3.1 (OS: Windows, ARCH: AMD64, CPU: AMD64)
Fri Aug 2 17:25:40 2024 -> Log file size limited to 1048576 bytes.
Fri Aug 2 17:25:40 2024 -> Reading databases from C:\Program Files (x86)\SmarterTools\SmarterMail\Service\Clam\share\clamav
Fri Aug 2 17:25:40 2024 -> Not loading PUA signatures.
Fri Aug 2 17:25:40 2024 -> Bytecode: Security mode set to "TrustSigned".
Fri Aug 2 17:26:11 2024 -> +++ Started at Fri Aug 2 17:26:11 2024
Fri Aug 2 17:26:11 2024 -> Received 0 file descriptor(s) from systemd.
Fri Aug 2 17:26:11 2024 -> clamd daemon 1.3.1 (OS: Windows, ARCH: AMD64, CPU: AMD64)
Fri Aug 2 17:26:11 2024 -> Log file size limited to 1048576 bytes.
Fri Aug 2 17:26:11 2024 -> Reading databases from C:\Program Files (x86)\SmarterTools\SmarterMail\Service\Clam\share\clamav
Fri Aug 2 17:26:11 2024 -> Not loading PUA signatures.
Fri Aug 2 17:26:11 2024 -> Bytecode: Security mode set to "TrustSigned".
Fri Aug 2 17:26:41 2024 -> +++ Started at Fri Aug 2 17:26:41 2024
Fri Aug 2 17:26:41 2024 -> Received 0 file descriptor(s) from systemd.
Fri Aug 2 17:26:41 2024 -> clamd daemon 1.3.1 (OS: Windows, ARCH: AMD64, CPU: AMD64)
Fri Aug 2 17:26:41 2024 -> Log file size limited to 1048576 bytes.
Fri Aug 2 17:26:41 2024 -> Reading databases from C:\Program Files (x86)\SmarterTools\SmarterMail\Service\Clam\share\clamav
Fri Aug 2 17:26:41 2024 -> Not loading PUA signatures.
Fri Aug 2 17:26:41 2024 -> Bytecode: Security mode set to "TrustSigned".
Fri Aug 2 17:27:12 2024 -> +++ Started at Fri Aug 2 17:27:12 2024
Fri Aug 2 17:27:12 2024 -> Received 0 file descriptor(s) from systemd.
Fri Aug 2 17:27:12 2024 -> clamd daemon 1.3.1 (OS: Windows, ARCH: AMD64, CPU: AMD64)
Fri Aug 2 17:27:12 2024 -> Log file size limited to 1048576 bytes.
Fri Aug 2 17:27:12 2024 -> Reading databases from C:\Program Files (x86)\SmarterTools\SmarterMail\Service\Clam\share\clamav
Fri Aug 2 17:27:12 2024 -> Not loading PUA signatures.
Fri Aug 2 17:27:12 2024 -> Bytecode: Security mode set to "TrustSigned".
So it doesn't load correctly and is restarted again and again until I stopped ClamAV by the global SmarterMail administrator.