cannot update Mullvad app

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Masaru Suzuqi -under review-
Desconectado
Joined: 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.

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