I have received conflicting answers as to what the System Requirements for the Mac are.

@daveferra Just to add more information, while the current version of Quicken works with El Capitan, the Quicken Mac Product Manager has posted multiple times that they will be ending support for El Capitan and Sierra in the near future. (You'll probably be able to continue to use the then-current version if you decline any updates, but that's probably only a viable strategy for a relatively short period of time.)