crave tv not working on macbook air

Which is lower than 10.11...

The version you're running does not meet the minimum requirements for the content you're attempting to access.

You will need to upgrade the version of macOS you're running, assuming your Mac can handle something higher.

Check the requirements on the crave TV web site.

EXACTLY what model Mac do you have and what version of macOS are you currently running.

Major updates can be obtained from the Mac App Store.

And what version of Safari are you running?

You have to give us something to go on here...

Then you can upgrade to Mojave, assuming any 3rd party applications you have are compatible with it.

Check before upgrading.

Open the Mac App Store and click on the Giant "Mojave" banner...