Hello, did you make a folder with the name of the bp and then put the bp file there?
About the link of the bp, Altair already told that when posting a bp on this forum, it's the choice from the autor to give the bp in the format of a link or file.
I also prefer to download the bps using the sharing link (only because I think it's more "safe" on steam version), but when I have to download the file I don't care because it's going to be the same thing.