This morning AVG AVAST removed slack.exe for Win64:Evo-gen.
Is this a false positive? Thanks for your help.

I ran an Avast repair from my computer control panel.
It looks like it works fine now

AVG removed but you run avast repair?

What and how many antivirus do you have installed?

Sorry, it was Avast.
In fact, I saw in the AVG forum that there was exactly the same problem with AVG (that looks like it is the same soft in fact).
But in my case, it was Avast

Hi, could you post here virusTotal link? Or upload detected file to ftp.avast.com/ftp/incoming and send mail with name of the file to submit@virus.avast.com

Thanks
Lukáš