Thank you thank you to Dezgard and bigblock for finding and confirming a fix for the updating!
Using that, I've implemented a
fix in SMOL for self-update and it's available on the Test channel (Settings -> Channels -> Test, then Check For Update).
There are still a couple of
work-in-progress features that I'm not ready to release yet that are in that Test channel, so I'm not going to push this to the regular Unstable branch yet (pro-tip, if you simply leave things in alpha forever, you can get away with anything. credit to Chris Roberts.). If you do switch to the Test channel, I highly recommend leaving the following two features
disabled for now.
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WIP Features
- Mod auto-backup. Toggle on/off. Whenever you install a new mod (or you can do it manually), SMOL will make a compressed copy of it in a folder you specify, giving you a backup folder with every mod/version you've ever used.
- Single-version mode. Toggle on/off. Deletes old versions of mods when you install a new version.
You can see how these two features will synergize

If you want to keep your mod folder clean but like to keep backups just in case, enable both. Or, if storage space is limited, just turn on single-version mode.