MS Remote Desktop on MacBook running Yosemite
There is no Macbook &quot;Early 2014&quot;. There's a Macbook Air Early 2014, which is perfectly capable of running Catalina 10.15 &amp; is not 'stuck' with Yosemite.
Microsoft have removed RDC v8 from the app store so your best chance  if their support won’t help you is from a 3rd party site - google &quot;microsoft remote desktop 8 mac&quot; for a few sources… however, whether or not these can be trusted is another thing entirely.
As your OS is so far out of date that it's already insecure, I wouldn't be rushing to download other potentially insecure things to it.