Mh... which one is EN (US)? I have 66 versions x86 and 66 x64. Don't know if EN (US) but certainly EN: Code: AMD64-all-mseinstall_8653f241799466fa67f9325ef257d47d5ec17dff.exe X86-all-mseinstall_218c931850de866ed10e43d023c538456b7a989f.exe
When I last tried out Avast 8 in Aug 2013, one could disable the browser addins in Avast Free. I found it to be light on resources and pretty easy to configure, and easy to export/import settings.
Avast 9 with its browser addins causes my IE10 to fail to start. I cannot uninstall these addins. I return to avast 8
Cause sticking to the Pre-Release version will enable you to upgrade to a future Pre-Release version, like v4.5.212.0 which was released today! The bad news for XP die hard fans is this version doesn't support Windows XP at all.