just install flatpak
here you can find instruction for various distributions
http://flatpak.org/getting.htmladd flatpak repo
install steam flatpak
sudo flatpak install flathub com.valvesoftware.Steam
run steam flatpak like this
flatpak run com.valvesoftware.Steam/x86_64/stable
if you want to add a partition outside flatpak container you have to add the --filesystem command
like this
flatpak run --filesystem=/sdaXZ com.valvesoftware.Steam/x86_64/stable
replace sdaXZ with your desired folder.
Install Cossacks 3 and run, hopefully it will work.
the problem is "cossacks.exe" is missing
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