I have had trouble with older versions as well on my past computers. Typically, if you want to run older software, you should run it on older hardware from the same era for the best compatibility. That is what we call the "Apple tax." Apple computers really do not have a great cost to performance ratio. With the quality from other computer manufacturers increasing readily and almost always featuring more power in their high-end models, I am surprised people are still so entwined in the Apple ecosystem. One of the main selling points is Apple's exclusive software/OS. I do not understand why they do not separately sell licenses for such software since that is the only real reason to buy an overpriced Apple product at this point.