Hi!
If I switch on avast firewall it’s will disable windows firewall or I have to do this manually?
Thank you very much,
KZS
Easy way to find out.
Enable the avast one and see if the Windows one is disabled.
Yes, but we use afb free version, so I asked it before the buy. 
There is no firewall in the avast free version. I would also think that would be the case for the free avast for business version. I don’t use the AFB version so I can’t speak from personal experience.
If it is displayed in the avastUI > Tools sections and isn’t showing a no entry sign (not installed) then you would appear to have a bug that some have reported in the avast free version, e.g. having paid options listed in the free version.
EDIT: Hopefully Eddy can get back to the topic as I believe he uses the avast for business version.
afb = avast business, the free version