Confusing message when an update is available (Linux AppImage)

[Pickysaurus]

Improvement

Currently

When an update is available on Linux, the pop-up in the app tells me I must update using a package manager but I am not using a package manager as I have manually downloaded the AppImage.

The "View Update" button is disabled, so I can't view the latest changes.

We want

To correctly allow AppImage users to update the app.

Supporting Information

(Include any supporting screenshots etc to support the above)

Design

(Any designs to required for this feature)