It seems that the unattended MSYS installer in the 18.104.22.168 RubyInstaller is broken.
Steps to reproduce:
Install Ruby (I used chocolatey, but the effect is reproducible with manual install)
ridk install 3 -> the expectation is that there is no prompt or other required user input
Instead, the MSYS64 installer is started in interactive mode and the ridk script does not terminate correctly.
Problem is also present in the new 2.7 installer.
The 22.214.171.124 package from chocolatey (latest from 2.5 series there) does the job as expected.
Is there an issue tracker you would like me to open an issue at?