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excatcher: Steam library imported successfully but all games marked as "not installed".
When I click "install" button it shows popup "launching steam game" but nothing happens.
Other library's games launches just fine.
October 2020 this is still happening.

I've followed the instructions as laid out below, but it didn't work, assuming I didn't do something wrong.

I'm pretty sure it was an update of STEAM which caused it. Cuz I've never seen Galaxy update.