Hello @mjfq,
I merged your discussion with the ongoing discussion on this issue.
To help troubleshoot this, is your file password protected? If it is, then please try this process: Revert your Quicken for Mac to version 7.9.1, then open a pre-conversion version of your file (a backup from before your Quicken upgraded to 7.10), remove the password (go to Quicken>Settings>Security, click Remove Password, then input your password in order to remove it), then upgrade your Quicken to the latest version and test to see if that backup you restored and removed the password from works in the current version.
https://us.v-cdn.net/6031128/uploads/5AMAR63PZDQ5/screenshot-2024-12-06-at-3-46-22-e2-80-afpm.png
For instructions on restoring a backup, see this article:
https://www.quicken.com/support/mac/how-backup-or-restore-your-quicken-data/
You can use this article to roll back to version 7.9.1:
Please let me know how it goes!
RESOLVED 2/3/25 Unable to Open Data File after updating to QMac 7.10.0 / 7.10.1

I just saw that ticket #11371778 (https://community.quicken.com/discussion/comment/20474755#Comment_20474755) was marked as "Resolved." I'm curious what that is supposed to mean. The issue was that a Quicken update caused Quicken not to be able to open the data file. It has been since November that Quicken has been working to address this. When working with Quicken tech support, the short-term solution was that I reinstalled an older version of Quicken and have been continuing to use that. To me, Quicken posting that the issue is Resolved isn't true - it certainly isn't resolved on my computer. And, no additional information was provided on the above discussion thread about how the issue was resolved (or what users should do at this point). My guess (hope) is that the problem was identified and that the update has been patched so that if I proceed to do the most recent update now, I won't encounter the same issue. But, I shouldn't have to do that experiment and hope it works. Quicken: will you please provide more details when an issue is "Resolved"? Add another post to the discussion thread that explains what users should do to address the issue, please!
Comments
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Hello @UniqueHorizon,
Thank you for letting us know you're still encountering this issue. This particular issue has a couple different potential causes. If you were encountering this issue due to a problem with the encryption, then the process described in this post should help correct the issue:
The other potential cause of this issue is if you use Google Cloud Backup. If you use that service, please turn it off or pause it when upgrading your Quicken program.
I hope this helps!
Quicken Kristina
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Hello @UniqueHorizon,
I haven't seen any response in a while. Do you still require assistance?
Thank you!
Quicken Kristina
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