Eucon Adaptor requires OS 10.5?!?

Migrating from Logic (slowly)
I’m trying to get my Artist series controllers to work, but when I try to install the latest version of the Econ Adaptor, I get the following error “You need at least Mac OS X 10.5.0 to install this software” - that’s GOT to be an error of some sort!

Any ideas?
10.5.png