I've just published URM 1.9.4 in the bèta channel.
You can
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, using the attachment to this post, or through URM (you might needs to switch to the bèta channels in URM under Options > Updates).
This version should be fully Ren'Py 8 compatible.
This was a bigger challenge than I anticipated, but everything seem to be working now and we're still backwards compatible with Ren'Py 6.99.14
Users who were trying URM on Ren'Py 8:
This release also contains some more potentials fixes for the rare saving issue.
Users who reported this issue:
Please let me know if this version works for you.