In the folder where you have downloaded the file "SCENARIO/LIMJ-GPL-7.7.0-RC2.7z"
do a mouse right click on it.
In the contextual menu opening click Check.
Open a CMD terminal (black) Window where you have downloaded the file
(probably your download directory)
Do it fast: Press Windows R, type cmd and press Enter.
type in it what isa after the prompt ">" :
C:\Users\Me\Downloads > certutil.exe -hashfile "LIMJ-GPL-7.7.0-RC2.7z" SHA256
and hit [ENTER]
you should have this answer :
SHA256 hash of LIMJ-GPL-7.7.0-RC2.7z:
0e2ef8b30d9280fca38a13efb8f4fe25fff407149d1f2920486b9d36b3ccad63
Certutil: -hashfile command completed successfully.
copy + past on your notepad the long 0e2ef8...ad63
copy also the one from the file "LIMJ-GPL-7.7.0-RC2.7z.sha256sum.txt"
Simply put, they should match.
If they do not, the download failed, just redo it or report us the situation.