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If you download Stardew Valley from Fitgirl you might encounter mentioned issue. Seems like Proton-GE no longer works.
If you facing issue like this just use Proton - Experimental.
Guide
- Open Lutris & Click the
+icon (top-left) - Select
Add Locally installed game - Go to
Runner optionstab - Finally you'll see wine version, Select
Proton - Experimental
Everything on steam has 2 hour demo. And if 12usd is too much, the android version is a little over $3.