Can't install OpenCV-4.5.0

[plonguini]

When the script tries to unzip opencv-4.5.0.zip I get :

"End-of-central-directory signature not found. Either this file is not a zipfile, or it constitutes one disk of a multi-part archive. In the latter case, the central directory and zipfile comment will be found on the last disk(s) of this archive. / cannot find zipfile directory in one of opencv-4.5.0.zip or opencv-4.5.0.zip.zip, and cannot find opencv-4.5.0zip.ZIP, period."

I already tried cloning the unzipped repository and running $git checkout opencv-4.50, but it didn't work either: "pathpec 'opencv-4.5.0' did not match any file(s) known to git"