6.0.3 is quite old, I don’t think you need the absolute latest, but anything past v9.0 should help. I’m on wine-9.22 (Staging) right now.
I’m not sure where I can download an older version.
I don’t think older versions are officially available, I used to scrape dates and versions from builds that referenced youtrack tickets on the release page and put them in url in format https://files.mcneel.com/dujour/exe/YYYYMMDD/rhino_en-us_X.XX.XXXXX.XXXXX.exe, but can’t reproduce this anymore (all are 404 now). If you don’t want to wait I’ve shared the exact versions of my past installers here (link expires in a week - in general running executables from strangers on the internet is a bad idea, but can’t think of any other way).
Regarding license error do you have gecko installed on your machine? I recall that it was required by the license manager, I think it used it to render html form required for license dialog. Also Rhino 8 since about beginning of this year moved to webview2 windows framework, which still doesn’t work on wine - I wonder if that might have been added to latest Rhino 7 as well.