cannot update Mullvad app

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Masaru Suzuqi -under review-
Offline
Beigetreten: 06/06/2018

Somehow I succeeded in downloading the update package. On Trisquel 9. After clicking the "install this package" (パッケージをインストール)button, the window disappears and nothing happens. Please let me install it.

AnhangGröße
Screenshot at 2020-07-02 09-46-31.png30.58 KB