Since I have a dialup internet connection
I insist on downloading the simple normal updates instead of downloading the full VPS should work much better, even for re-installations.
If you have problems with downloading 40MB on dial up, then you may want to download it from an "Internet Bar" or alike, but only when you already know you will need it.
In the mean time, for daily use, you should configure Avast:
Avast main GUI -> settings -> Updates ->
Update parameters -> "
I only connect to the Internet using a dial up modem".
That setting should improve your connectivity from Avast.