It’s in the software manager. Have you tried from there?
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Option 1: When you go to their website for the flathub link, it takes you to a download for a .flatpakref file. Dowload that and run it. It will open the Software Manager to the gopher64 entry. If it isn't opening with the software manager for some reason, tell it to open .flatpakref files with the Software Manager.
Option 2: Search for gopher64 in the Software Manager.
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Be aware that Mint disables you from finding non-verified flatpak applications by default. You can enable it in the GUI somewhere
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It's is supported but iirc you still need to actually install flatpak before you can install anything from flathub.
You'll find the instructions on the flatpak website.
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