Doen't install from downloads

Hello I’m new to Linux, 6months, installed Mint Debian edition. Trying to install Manager. downloaded it but it refuses to install. doesn’t do anything from the download folder. Zero, nothing.

Update: I got a missing permissions prompt when opening with package installer.

The Linux file is an AppImage and does not need to be installed

To keep it simple place the file on the desktop then right click on icon and then on the permissions tab and click ‘Allow executing file as program’

Then you just double click the file Manager file on the desktop and it will run

Thank You. I started right up.