Thank you for your post. @Suedkiez is correct here; the Roon minimum hardware requirements have updated as of April 27 (the latest release) for both stability and security reasons.
There is a temporary installer available here for users who are in a bind without Roon in the meantime:
One workaround if you wish to keep this current hardware setup is to use the OCLP (Open Core Legacy Patcher) app as described in the post above.