

About that, or less. Right click > inspect element and then select the text and type/paste whatever you want.
Alternatively, take a screenshot of the site, put a white block over whatever you want to replace, then insert the new text. Takes a tad longer, but requires less technical know-how.
Basically, you’re just looking for PC game stores that carry free games other than Steam, right? In that case, Itch.io is the main place to look. Beyond that, games will primarily be distributed on their developer or publisher’s website. Piracy probably won’t be an easy option, as people aren’t going to put in the work creating/uploading pirate copies of a game thats easily available otherwise.
Edit: Also, I think you may be able to use SteamCMD (Steam’s non-launcher, CLI tool) to download the game if its DRM free.
Something like this in SteamCMD:
spoiler
login anonymous
force_install_dir <install directory>
app_update <app id> validate