can't install Skype on mac 10.10
I'm getting a circle with a line thru it when i try to install Skype on my yosemite 10.10 iMac
iMac 21.5″, OS X 10.10
See the following from Microsoft support https://support.skype.com/en/faq/FA10328/what-are-the-system-requirements-for-skype
Skype on Mac requires Mac OS X 10.11 or higher
Also, the model year of an iMac is available at Apple menu > About This Mac.
An early 2009 iMac can be upgraded to El Capitan 10.11.6 but no later version See: https://support.apple.com/en-us/HT211683
A late-2009 through mid-2011 iMac can be upgraded to High Sierra 10.13.6 but no later version.
A late-2012 through late-2013 iMac can be upgraded to Catalina 10.15.7. See: https://support.apple.com/en-us/HT211683
A mid-2014 or later can be upgraded to the current version of Big Sur. See: https://support.apple.com/en-us/HT201475