
When you purchased RealPlayer Plus, you would've been prompted to install RealPlayer. Anyway, here is the solution for you.
First, you will need to install RealPlayer by following the instructions from the below link.
https://customer.real.com/hc/en-us/articles/360047590914-Installing-RealPlayer-20-20
Once you have installed RealPlayer, you will need to sign into RealPlayer by following the instructions from the below link.
https://customer.real.com/hc/en-us/articles/204040653-Signing-in-to-RealPlayer
Please note: Typing RealPlayer Plus in your browser is not the right way to do.