Install vpn Private internet access

Anybody knows how I can install the desktop version of this vpn: Private Internet Acces?
I recently bought a subscribtion with them. Installed the extencion for Chrome, which works fine, but the add-on for Firefox doesnt works.
Therefore I want to install the desktop version… Only it’s for Linux, and I don’t know how to install it, orif it’s even possible?

It’s this file:

Thanks in advance.

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