SOLVED: I noticed that a website was not loading on my laptop, returning an error saying I was being blocked, but it was working from my phone on the same network. It occurred to me that this might be related to my problem with the installer, so I rebooted the laptop and fixed both issues.
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I have my mnemonic, but when trying to recreate my wallet the installer crashes when it cannot contact the server for the ToS.
I read online about other people having similar problems, and resolving it with a newer version from GitHub, but that was way back in 17/18.
I tried using an older version and had the same result.
Any help is appreciated.