I am running Quicken on Mac and I have not been able to upgrade from version 8.4.2 to 8.5.1. Each time I start up Quicken a screen comes up telling me to upgrade to 8.5.1. I tell it to upgrade, but when it restarts it is still version 8.4.2 and wants me to again upgrade.
I am running an Intel iMac that is running MacOS Sequoia and can not run Tahoe.