As @gr mentions, I’m wondering what you mean by “dropbox links” … and wondering exactly what you are doing to attempt to open these Scrivener projects. Further, my hunch is that your issue has no connection with Apple’s battery replacement. Such a repair would do nothing to the file system (unless of course they indeed did something, but I wonder).
I’m wondering if perhaps since the last time you used Scrivener you updated the Dropbox software? If yes, then there may be two things in your way.
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Dropbox has changed the locations on your local file system to conform to Apple standards or something. Here is a “future tense” article explaining the changes, which now have been done by Dropbox. Expected changes with Dropbox for macOS on File Provider - Dropbox Help
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As @gr suggested, Dropbox files may be “online only” and not available to Scrivener which requires all files to be on the local file system, e.g. “offline”. See How to make files and folders available offline - Dropbox Help
Edit: The Dropbox version I have is v171.4.6182 and it uses the new local file locations as described above.