rtwientjes Said:
"How do you update a software on a MacBook Air from 2014?: I have a MacBook Air from 2014, it is very out of date on it's software and I am unaware of how to update the software in order to download the Cricut Design Space."
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Incompatibility Seems to be the Culprit:
Contact the Developer, asking them which is best for you. Provide them with your Mac's Model, Year and the macOS that is installed.
Finding Mac Info:
Click: Apple logo located in the far left corner of the taskbar
Select: About this Mac