When a large game like Just Cause 4 (which requires about of space, according to Steam ) is split into parts like .part01.rar , .part02.rar , and so on, they all function as a single unit.
Dealing with multi-part RAR files can be a bit tricky if one part is acting up or if you're new to the process. Just_Cause_4_Complete_Edition-Razor1911.part06.rar
Are you getting a when you try to extract that file? When a large game like Just Cause 4