Hi Admin,
This is not really a new ticket as such as i fixed it but thought i would post here to let you know as i guess its an issue that may arise again in the future and i also have a workaround
THE ISSUE
After making some major changes to your project such as table names, fieldnames , fk names, layout names... you may encounter a 404 component not found in the sandbox but your download appears to work and function as expected
WORKAROUND
- Clear the dataset by using the Flush Dataset Option on the Projects Tab / Page in the builder
- rebuild the project
- project now available in the sandbox
- you may see a mysql error on some pages (admin side - didn't test front end)
- rebuild the project again
- enter sandbox all worked for me as expected