Really should just be a case of dropping the downloaded bs_patch.rpa file into the Blankspace\game folder alongside archive.rpa - while it shouldn't hurt anything, you shouldn't be seeing any extra folder created either as far as I recall! When you click the download link, are you NOT just getting a single bs_patch.rpa file? I could pop a copy up somewhere else if that might help.
Should look more or less like this when all's done (this is my own PC!):
Viewing post in Blankspace - Additional Text Patch comments
Thanks for your answer, xolf! As I said I don't get the file itself, instead itch asks me, where to install - and then procedes to create that folder with subfolder and nothing inside. That's why I am asking if there is any other way of getting the file itself and installing it manually.
Edit: if you could indeed upload it somewhere else for me that would be SO nice of you as I'm sure that would solve the problem.