The only other two .pdf files I find associated with SignLab are the 255 page font and clip art directory (36 MB), and a 12 page file for resolving security device (dongle) issues.
CadLink used to have a generous assortment of downloadable help resources, but it's nowhere to be found. Their user forum also seems to have disappeared.
I did find this. It looks as though it only launches and functions in an open window of SignLab.
Pretty clever. That's one way to keep prying eyes out:
https://help.cadlink.com/website/signlab_vpm/en/index.htm
JB