A .dmg file is a disk image, not necessarily the installed application. Opening it can mount a volume containing the app or an installer.
Follow the genuine developer’s instructions for that package. Reopening the disk image every evening can mean you are launching from the installer volume rather than the intended installed location.
Identify what the download contains
Use the developer’s official source and inspect whether the download is a disk image, a package installer or another documented format. macOS can present each differently. Do not assume that every app uses a drag-to-Applications workflow.
A mounted volume can appear in Finder after opening the image. Its contents may include the player and setup instructions. Read those instructions before moving files or approving an installer.
Complete the supported installation
If the developer directs you to copy the app into Applications, do that deliberately and wait for the copy to finish. If a package installer is supplied, follow its legitimate prompts and read any requested privilege. Use the actual destination specified for that application.
Launch the installed copy from Applications or its supported launcher route. Check the app’s identity and version. Avoid leaving multiple copies with ambiguous names in Downloads and Applications, because later updates and shortcuts can point to different builds.
Keep macOS security prompts in context. A disk image does not establish publisher trust, and bypassing a warning is not a routine installation step.
Eject the installer volume when it is no longer used
After the installed app works and no process is using the mounted image, eject that volume through Finder. If macOS says an app is using it, close the relevant app normally and check which copy was running. Do not force-remove an active volume blindly.
Deleting or ejecting the disk image is different from uninstalling the copied application. Verify that the installed player still opens from Applications afterward. This process concerns software location; it does not activate IPTV USA or verify any service account.
Useful answers
Is the .dmg itself the installed player?
Not necessarily. It is a disk image that can contain an app or installer.
Does ejecting the installer image uninstall the copied app?
No. A separately installed copy and the mounted installer volume are different locations.