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

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RSSrsvp Veteran Member • Posts: 3,235
"Unsupported Library" cannot open my photos stored on an external drive

Over the weekend I upgraded to Catalina from High Sierra and discovered I couldn't use my Microsoft Office apps (Outlook, Word, Excel and Power Point because they were 32 bit. I used the Data Migration tool and rolled back to High Sierra. My photos are stored on an external hard drive and I discovered the following message when I attempted to open my Photos app. I then upgraded to Mojave which still supports 32 bit apps and this message still appears. I have 166GB of photos stored on the external drive and frankly and I am freaking out! How do I recover these pictures?

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