itch.io

what kind of malware you got... everyday a lot of people download the game without any issue

Ok some clarification.
The installation file is named: BF2Setup.exe and this is valid file. 

It come from Biznes Filmowy 2 Setup (which is original - Polish name of the game so that is why BF2Setup).
Yes you may encounter some warning about dangerous file from browser (e.g MS Edge) as all not signed with certificate exe files had similar warning.
File is save no issue with it.