Avast won't let me restore a file from the virus chest.

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   So I got a game on steam recently and got the DLC for it today and Avast detected it's EXE as a virus and put it in the virus chest and says "Whoops error occurred, this file can't be restored." I'm 100% certain that this is false and steam isn't properly restoring the file.

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I found a way to fix it. I whitelisted Steam and then had steam redownload the file. Still don't know how to reove it from the virus chest though. I just noticed that trying to delete the file from the virus chest doesn't work either. Doesn't even give an error, it just does nothing.

[mchain]

I suggest using these steps provided by bob3160 here at avast forum to see if your virus chest issue is fixed: 
https://forum.avast.com/index.php?topic=220142.msg1467785#msg1467785
Repair and clean install works for all versions of avast.