On checking our records, I see that you have purchased RealPlayer Plus 16. Customers who purchased RealPlayer 16 Plus can continue to enjoy their Plus features at no extra charge when we released RealPlayer Cloud but in the new RealTimes these features are available only with a Premium or Unlimited subscription. Therefore you are unable to access the Plus features like burning DVD. This is why you are getting the pop up to upgrade. To know more on pricing and features, please click this link: http://www.real.com/realplayer_pricing
If you still wish to reinstall the previous version RealPlayer 16 follow the below link:
http://cache-download.real.com/free/support/win/RealPlayer16.exe
Before installing RealPlayer 16, make sure you uninstall (alone) any existing version of RealTimes by following the link:
https://customer.real.com/hc/en-us/articles/204040013
After downloading the free version, sign in to access the Plus features of the player: To do so click the link below:
https://customer.real.com/hc/en-us/articles/204040653
After getting the RealPlayer 16 with the plus features, try converting the file.
Note: Please be aware that we are no longer making any updates to RealPlayer Cloud or RealPlayer 16, and popular features such as Download This Video may not work on these versions. Therefore, we strongly recommend using RealTimes.
I hope this information will help you.