Firefox’s free VPN will offer 50 gigabytes of monthly data, which is pretty generous for a browser-based VPN. A Mozilla account is required to make use of it, which isn’t a hardship (they’re free), but is a point of friction some may wish to know upfront.
I am still on windows, I want to make the switch but my main computer broke, the cursor and the keyboard stopped working despite not being connected to the internet for years. And my backup computer the C drive is almost completely full which I have no fucking idea how that happened as I have barely done anything on this piece of shit. So I’m afraid if I try to download Linux I will end up with no computer that works. I am not a tech guy obviously.
You could try connecting an external keyboard/mouse to your main computer.
As for the backup one - how much space do you have left? You’d need between 4 and 6 GB to download a Linux ISO and around 2 MB for Rufus with which you’d build a bootable “live USB”.
If you don’t have even that much, grab WinDirStat to check what exactly is taking up so much space - maybe you can remove some of it.