Quicken Support:
I had the exact same problem. I just upgraded my PC from an almost 10 year old Win8 to a new Win11 machine and ran into the same realization others have which is Quicken is a subscription model only now. I end up finding and downloading the original software (cd image) from a sketchy website called getintopc. It wasn't Quicken Deluxe, Home and Business was all they had. The browser warned me not to proceed but I nervously did anyway. I ran Malwarebytes scanning on it which came out negative. I installed the software and it seemed to work fine. I scanned the install directories and again seemed fine. Then I downloaded the latest patch from the site mentioned above and that installed fine. And then I was able to open and use my Quicken files that include data from over 25 years ago! Now it looks and feels exactly as it has for the past 8 years. Very happy and I just wanted to post the above in case somebody else comes along in the same boat.