Not possible to reinstall applications using .deb files

[mhalano]

In the edge version of the app center, 0+git.460b236, I can install an application using a .deb package, like Steam, Zoom, Slack, etc. The problem happens when I'm trying to reinstall. The button to install doesn't become green, meaning I can't click on it.
My use case is applications that don't have a repository, like Zoom. With each update of Zoom I suppose to download and reinstall the package.

[DareanW]

I would also like to report a very similar, if not exact issue. Discord, for example, updates very often. When opening the downloaded .deb with the next version number, the Installed button is still disabled because the user "has" the software, despite it not being the correct version.

The proposed fix is to check the version number, and prompt to update if the .deb number is greater than the installed version.