if you own an Enterprise Combo Standalone + C4D v4 license, and want to upgrade to 2018, you need to upgrade your licenses following these steps:
- 1. go to the Otoy Buy page here.
- 2. press the Upgrade in the top menu.
- 3. choose between one (199$), or two (399$) annual maintenance plan.
- 4. press the Buy button, and complete the purchase.