Same Problem for me on a Windows 2008 R2 x64 .... he stop on "Installing service"
Hi,
we've just re-checked this platform in our QA department and it is possible to install the released package on this platform. See the release notes to see explanation of what appears as "hang".
As the release notes state, there will be a better progress monitoring in future releases. In the meantime, if you think the installation stopped progressing, please observe "c:\ProgramData\AVAST Software\Administration Console\mirror\" and it's subfolders, where mirror is being build. The download operation takes quite long (depending on the speed of your internet connection). Depending on the speed of your internet connection, you should see updates to the above folder/subfolders.
Regards
jx