@lottelein
I have never seen RealPlayer available for the Roku, but their knowledge base indicates they had a channel/app for older Roku devices, so does look like it existed at one time, but is no longer available.
https://customer.real.com/hc/en-us/articles/204043053-RealTimes-and-Roku
Roku Community Streaming Expert
Just another Roku user... I am not a Roku employee.
Insignia RokuTV, Ultra 4660, 4802, 4850, Premiere+ 3921, Express 4k+ 3941, Streambar 9102