Got "APP is not verified" Error on Macs Joshua Chang October 15, 2018 03:41 Go to https://www.tiertime.com/downloads/software/, find the LKD File for MAC V x.x.x.x. Open UP Studio, choose Activate, and then load the LKD file. Related articles Where to download the Mac Version 2.4 UP studio and how to activate it? Why Mac Vers.2.4 UP Studio Show "Please Activate" all the time? How to activate the printer Software Interface Why there are extra layers when I chose no raft no support ?! Comments 0 comments Please sign in to leave a comment.