Zemax opticstudio premium 20.3 Setup files ONLY 2020 release Contact me for more. email:globalrobotsolutions@gmail.com skype:yeehlee Refer other site: https://vimeo.com/yeehlee Zemax Opticstudio 17.0/17.5/18.9/19.4 2017/2018/2019/2020/2021 with SN **welcome to trial license** How to get zemax trail license from me? read carefully.note! 1.download files from below links. 2.read install manual. 3.run hardware getid,(sometimes,you should disable antivirus,otherwise forget it,delete!) 4.send hardware id to me. 5.i will send a file name serial.txt to you.or serial number,then you need save to serial.txt for your PC. 6.copy patch&update files to install directory. 7.enjoy it.contact me. Download links: Zemax R13 https://mega.nz/folder/pQxnlS5T#rt7EygpnTLNsLMWe8z8fJg Zemax 18.9 SN https://drive.google.com/drive/folders/18lRTQDhP36z3zqqDfvSQ2w49JPxVNr8x?usp=sharing Zemax 19.4 SN https://drive.google.com/drive/folders/1PJcVzD0d9hK38HeTtkGo__iDI7u3ICqj?usp=sharing Zemax op