Is this setup file "vpsupd.exe" regularly updated?
Yes. But the automatic update should work
Please, upload (attach) the avast log:
C:\ProgramData\AVAST Software\Avast\log\Setup.log
or C:\Program Files\Alwil Software\Avast5\Setup\setup.log
If the file is too big for the forum, post the
last 400-500 lines of it.