can i download apple tv on my Imac?

tonyvee3 wrote:

can i download Appletv+ to my iMac its my version is macOs High Sierra 10.13.6

can u give me some feed back

No, but according to Devices you can use with the Apple TV app and Apple TV+ - Apple Support you can use a web browser:

"On the web

• Go to tv.apple.com"

I believe it requires Catalina, but you can ask on the Apple TV app forum too to be sure.