.7z is a zipped file, you just unzip it exactly like you would a .zip. I use 7-zip because it compresses better than the default windows zip, and makes for smaller downloads.
That makes sense for download size, but my problem is the fact that the download doesn’t result in a file, it just results in a link to re download the file automatically. There is no option to extract, unzip or anything similar, sorry if this feels like banging your head on a brick wall...