"Unsupported Library" cannot open my photos stored on an external drive

Started 2 months ago | Discussions thread
Tom_N Forum Pro • Posts: 16,581
Re: "Unsupported Library" cannot open my photos stored on an external drive

RSSrsvp wrote:

RSSrsvp wrote:

terrydev wrote:

The problem here is that your Photos library was upgraded to a v5 library when you went to Catalina. Photos on Mojave is a v4 and the earlier app can't ope the later libraries structure.

I'm sure you had a back up before upgrading from HS, so simply replace the Photos library with the back up and upgrade to v4.

Thanks, I am following your recommendation and replacing the Photos library from the last Time Machine backup done before I upgraded to Catalina right now. I am crossing my fingers that it works.

Update: it was not successful. This is the message I am seeing when attempting to open up the Photos app that I just replaced.

He said to replace the Photos Library – not the Photos app.

(You might want to back up the 'Catalina-format' Photos Library on a spare drive first, just as a precaution.)

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