Load error on Sketchup 2019 startup for the KeyShot plug in

[Blumer]

Hi all,
I am running the latest version of SketchUp Pro on a mac using OS Catalina.
I have installed the latest plug in for KeyShot export, but I am getting a load error message.
I've attached a text file of the message.
Has anyone experienced this lately?
I searched a bit here and see it was a problem back in 2011, but didn't see any recent posts.

[Sune]

Which version of the plugin are you using?

We very recently released version 1.3 which should fix this issue.

You can download it here.

[Blumer]

Thank you!
The version that Sketchup points me to in the extension warehouse is version 1.2.
How do I install this version, I am only familiar with installing extensions using the extension manager, and that only gives me access to the older version.

[Blumer]

I figured out how to point the SketchUp extension manager to a file on my computer (the latest download you gave me the link for), but now SketchUp is telling me the plug in is "not signed", and that I need to contact Keyshot for assistance in getting the plug in signed.
Are you familiar with this process?

[Blumer]

I'm sorry to post so often, but after sitting and re starting SketchUp 3 or 4 times the extension has loaded and seems to be working.
Thank you for your help!