Hi there,
I just fired up CTA4, and checked for updates.
There is one, so I've downloaded it and attempted to install it, but I'm thwarted by a message that the software package cannot be installed, because Apple cannot identify it.
I'll attach a screen shot of the dialogue box.

I'm using a Macbook Pro, running Catalina v 10.15.6, Cartoon Animator Pipeline v. 4.21.1808

Any insight into this would be appreciated :)
Thanks in advance!
Kimber