Got "APP is not verified" Error on Macs Joshua Chang October 15, 2018 03:41 Follow 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 Why Mac Vers.2.4 UP Studio Show "Please Activate" all the time? Chapter 1. Cetus MKIII 3D Printer Parts Introduction How to solve non-Administrator users cannot operate the software in a domain/school network? The Preheat Function in Maintenance and in Print Setting UP 300 User Manual Comments 0 comments Please sign in to leave a comment.