Hello,
I installed retropie retrOSMCmk2 script on my Rpi 4 and everything went fine: installed emulators and some ports works very well 
Now, I would like to update retropie-setup and the other retropie scripts because I discovered a repo with some, almost experimental, launcher scripts not yet included in the current Retropie version, but they require RetroPie version 4.8.9 version to run.
If I try to update Retropie scripts executing retropie_setup.sh, the version stucks at 3.8.5 because retrOSMCmk2 fetch updates from the fork at GitHub - hissingshark/RetroPie-Setup: Shell script to set up a Raspberry Pi/Odroid/PC with RetroArch emulator and various cores which is not in sync with the official repo GitHub - RetroPie/RetroPie-Setup: Shell script to set up a Raspberry Pi/Odroid/PC with RetroArch emulator and various cores.
My question: is there a simple path to upgrade Retropie at latest official version 4.8.9 ?
Thank you for the attention.
Kranz