ID:2927157
 
(See the best response by Lummox JR.)
new version does something that avast mistaken as a virus, anybody knows, where to install an older version? avast deleted all the byond and i just can't do anything, it's not my computer and i don't have access even to stop avast from background tasks (and i'm bad at english lang)
Best response
Avast has been broken garbage for over 10 years. Don't use it. But before you stop using it, report this as a false positive.
Every time this comes up we ask folks to please report BYOND as a false positive to Avast. Most of the time they do so. And so far Avast has still done nothing.

You no longer really need an antivirus software. Windows Defender is sufficient for 95% of cases and Malwarebytes can bridge the gap when needed, but overall you just don't need it anymore.