It works fine from the TM too.
Only reason I brought it up is that it's leaving my TM with an error under "updates available". I'm not sure how it will impact the TM checking for and downloading updates for other trainers when it's in the error state.
Just did both and same error.
It goes through the process of authorizing the download and then ends up with the error I posted above. I had assumed it was a setting related to the trainer on your end that made the TM believe the trainer was out of date. It started after the TM update for the "mobile ready" feature and Slime Rancher has that feature.
So you have the Steam Slime Rancher trainer in your TM and if you restart your TM it doesn't show the trainer is in need of an update and attempt to update it?
If that's the case that's weird. I'll just uncheck keep up to date if it's only me that's having the issue. I was just concerned it may break the auto update feature on other trainers for people who leave their TM running for extended periods.