
Opt-in versioning is not something that roll20 supports, therefore I cannot support it. Even if I could I probably wouldn't as supporting multiple versions of a product is a nightmare. You can drag and drop spells to all of the spells sections, including the NPC spells section (as part of the latest release, not the currently live one on roll20. But since you're a pro you can use the very latest using the instructions in the OP). I'm not sure what issue you're encountering.