To install Flatpak, follow the official guide.

To install OTPClient, open a terminal and the execute:

flatpak install flathub com.github.paolostivanin.OTPClient

⚠️ Please note that with the flatpak version you won't be asked where to store the database. Instead, the software will use the app's data directory (/home/USER/.var/app/com.github.paolostivanin.OTPClient/data).

This change was necessary in order to restrict the app's permissions to NOT HAVE full access to the host's filesystem.

Because of that, if you want to import a file you have to place it under the aforementioned folder (/home/USER/.var/app/com.github.paolostivanin.OTPClient/data).