system
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I found this interesting in an XP issue from 2016
https://forum.avast.com/index.php?topic=189516.0
Talks about some reasons for conflict.
Also, I found in the FAQ from 2017 another link where it seems to give different setup files based on OS
See bottom of page for that.
https://www.avast.com/faq.php?article=AVKB3#articleContent
I may try this and also use the avast uninstaller that is part of the program as well as the avast clearer uninstaller. AS well as stripping out what I can from the registry.
For the one machine that it was sort of working on, it is now chugging the whole thing to the point of locking up like the one I had to uninstall it on for the same principal but even worse conditions