I have Dorico 1 and 2 in different folders. Can I delete Dorico 1 folder without running into problems ?
If you don’t intend to use Dorico 1 again, then it should be.
Of course, it’s always safe to delete anything when you have a good backup strategy that allows you to restore it later.
If you’re on Windows, I would suggest running the uninstaller rather than deleting the folder directly.