Yesterday I bought a 2015 MACbook for running QTR, Epson print driver, QCDN V3, and SpyderPrint. The laptop is running OS 13 (Mojave) and cost me $100 with charger. ?I am hoping this small investment will save me the wasted time and frustration caused by Apple updates and incompatibility issues. I will do all of the QTR curve creation functions on the MacBook, and I will process image files on my Mac Studio and transfer the files to the MacBook via file transfer for printing.