Recommend giving https://github.com/andrewbanchich/shreddit a try - it supports using the GDPR archive out of the box, no code changes required.
Reddit Migration
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Thank you for the link. Any guides to making this work? I'm a bit confused because I downloaded the exe, but it won't run so I'm not sure what to do, even after reading the directions on the github.
The instructions on GitHub are the guide.
I would start a new thread in this magazine and tag the folks who said they already used shreddit successfully to see if they can help.
The only other advice I have might be that the exe is bad so try finding a good guide for setting up WSL2 and then running the Unix version of shreddit in there. (I think most folks who did it successfully are on OS X or something)