The easiest way to install the app is to get it on Flathub. You can also find DEB and RPM packages in Inform's release notes.
After installing it, you'll find it in the apps grid or menu or wherever else you start your apps from.
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If you have installed a pre-release package, you may need to first remove it entirely before you install an official release.
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If you need to try the latest and greatest features, or you want to help develop the app, see the build instructions to build your own copy from the source code.