How do I import these elements?
Follow the instructions in the Oxygen Builder website: User Design Library
Then do the following:
- Open Oxygen builder
- Check Enable 3rd Party Design Sets
- + Add Design Set
- Paste licence
You will be able to see it now when you edit page with Oxygen and open Library.
Do I have to buy the Design Set again when there is an update?
No, you pay one time and you get the Design Set forever, that includes all the future updates (bug fix & new elements).