Development of RDi has been slow for the past several years, and moving the product development to Fortra (HelpSystems) hasn't made this any faster. I used RDi on Windows and Linux until I switched to (and joined the development of) Code for IBM i, the IBM i development extension for VS Code and VS Codium (my choice) and other spin-offs. Now I never use RDi anymore, even though it is still installed on my laptop.
I liked the idea of RDi being based on Eclipse and platform agnostic - however, this seems to not be the case anymore, with RDi 9.8 for Linux missing and several issues in the past with RDi on Mac.
For that reason, I recommend you try out Code for IBM i, which is truly platform agnostic and runs well on Windows, Mac AND Linux. It may take time to get used to since it's quite different from RDi, but there are tons of documentation and help available and eventually you will feel it natural. If you're not totally happy with Code for IBM i, the project is open source and you can add functionality yourself, or make a request for enhancements. Since this is open source, all is available to you - the code, the documentation, the support. And besides, there are tons of extensions for VS Code and you may end up finding that you use VS Code for much more than programming - like I do... :-)
Best regards,
Christian