If you install windows 8.1 preview , applications won't migrate to windows 8.1 final . If you install the final 8.1 on windows 8 it will .
This image explains it.
Attachment 14154
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If you install windows 8.1 preview , applications won't migrate to windows 8.1 final . If you install the final 8.1 on windows 8 it will .
This image explains it.
Attachment 14154
If you intstal AVAST antivirus on Windows 8.1, then Windows will broken (deleted system files).