If you haven't
rebooted Windows since you installed the latest software update, please do so
now and then try Quicken again.
Still not working?
Let's try some
"Troubleshooting 101" to ensure the Quicken software is installed and
updated properly and that your data file is in good working order.
Please perform all the steps in this document:Troubleshooting
101 - Fixing Software Installation and Data File Problems
Check if Windows
Defender feature Ransomware protection is enabled.
If so, configure it to add Quicken as an "allowed app" without
turning off Ransomware protection:https://community.quicken.com/discussion/7857675/faq-windows-defender-controlled-folder-access