There is no difference in the installer for Xeams Community and Enterprise Edition. It will run as if you have purchased the Enterprise Edition for the first 30 days. It will then get converted to Community Edition unless a license is purchased.
Andrew,
How often do you see this message? It just means ClamAV took longer than expected to determine if a virus was found in the message and the client (Xeams in this case) timed out.