ClamAV Signature Update fails

Question / Problem

ClamAV does no longer update its signatures. Even starting freshclam.exe manually fails.

Answer / Solution

This problem can be caused by the Windows Defender or other third party anti virus solutions. Add the following paths to the exclusions:

C:\ProgramData\JAM Software\ClamAVInABox\Signatures

C:\Program Files (x86)\Common Files\JAMSoftware\ClamAVInABox\sanesecuritydbtemp