Cant Install ProtonVPN through Obtainium or Manully

[TayLo1801]

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Hello ProtonVPN Team,

I previously had the GitHub version of the app installed on my GrapheneOS Pixel 9 Pro XL (Build version: 2025110801) using Obtainium (open-source APK sideloader).
I recently tested the Google Play version (sandboxed Google Play with minimal permissions and no system access) for a while, and now I wanted to switch back to the GitHub version.

However, I keep receiving the following error:

“App not installed as package appears to be invalid.”

This happens both when I try to sideload the APK manually and when installing it through Obtainium.
I also receive “some errors occurred: invalid [android.app]” — even when I try adding the source code ZIP.
(You can also see these errors in the attached images.)

Has the package been moved or changed?
Even when I try installing the version from F-Droid, I get the same issue.

Could you please help me with this or provide instructions or support?

Thank you.

[TayLo1801]

Update Package name is identical as the Playstore Version