Does it means that I lost all the pictures I had saved inside iPhoto? The app on my Mac is grayed out and the pop-up message is not giving me any clear explanation.
MacBook Air 13", macOS 10.15
No. Launch Photos with the Option key held down, click on Other Library, and choose the iPhoto one.
(175469)
No. Launch Photos with the Option key held down, click on Other Library, and choose the iPhoto one.
(175469)
iPhoto was discontinued more than 4 years ago. It is no longer developed or sold. It was replaced by the more powerful (and free) Photos.app that comes with the OS. You can migrate to that app very simply:
Hold down the option (or alt) key and launch Photos. From the resulting menu select 'Choose Library' and point at your iPhoto Library. It will do the rest.
If you prefer not to use Photos there are several 3rd party apps that you can use. Which to choose depends on the kind of photographer you are and your budget.
iPhoto is gone!
