I've been using clamwin 0.99.4 for awhile now and I installed Version 13.3.1 (43365) Parallels update which fixed my Microsoft Windows 10 April 2018 1803 problem but now clamwin 0.99.4 can't update the definitions. I had no problems clamwin updating definitions before this Parallels update. I clamav on my host system which uses the same website database.clamav.net to get its update which I have no problems with but on the guest OS it has the problem.