I am running a desktop Mac OS X Yosemite 10.10.5 and i can't access other devices as they are running new versions. I have tried to update latest version but get stuck with the location available when trying to select destination.

I have checked OS X updates and my version says it is up to date. Is there a different version i need to download/install so it can work with Yosemite instead of El Capitan?
I have removed previous versions of TV also and tried to run this process numerous times.
Cheers