Specifically, what do you mean by, “Is there any way of downloading 5 again ?”
You can download the Mac V5.5.4 DMG file from the Archives section of the Download page.
Assuming you have a V5 license key, you can use it.
It sounds like you are expecting a plug-in tool for V5 to work with V6. That generally is not possible as each version of Rhino has it’s own unique Software Development Kit (SDK).
That’s great. No I’ll just download V5 and the bridge for that and carry on working in V5 until this issue with V6 is sorted.
I uninstalled 5 as I thought there might be some file pathway issues causing it.
But I need the Keyshot bridge more than any new functionality in 6.
I asked because of the non-specific meaning of the term “download”.
It means very different things to different people.
As a tech support monkey, it can be infuriating at times.
You didn’t upset me, you confused me so I replied with clarification, and more detail than I would for a question I fully understood.
No harm no foul.
Be well.