Too many errors

Hello,i downloaded a cheat source code and when i open the
original .sln file,i got like 600+ errors,and i use the exact
same version of sdk and platform toolset which is v141
but when i make a new project and add the existing files
i got like no errors,why this is happening?

Does anyone knows why i got so many errors?

Maybe the source is outdated

Yeah i did it,600 errors..

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No no,source released 3 days ago,the compiled cheat who it came with the source is working fine,it does it with every source cheat i
find..

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Well this helped a lot, cheers mate!