There is no need to create multiple new threads because of this, so I deleted one and merged the other with the support thread.
AVG is a crappy AV, which blocks everything even if you make exceptions except the creator is making agreements with them. Clearly an AV creator who is all about making money instead of a quality product. So best solution would be to use a lightweight AV from a good developer which is not playing your mommy and forbidding everything you do on your computer, blocking pinging for example is just stupid. The best way to prevent viruses is using your brain.
If you do not want to use a proper AV then you have to wait. I am going to release a launcher update this weekend which has a second way to check if it is online so people with blocked pinging events can also update the mod via the launcher.
A setup download for 4.1 is not available.