Hello! Apple recently introduced a Macbook with a new “M1” CPU, rather than the usual Intel CPU. This new CPU requires that any software written for standard Intel or AMD processors has to either be re-written for the new CPU or emulated via virtual machine software such as Virtualbox, VMware Fusion, or Parallels. Zemax products (OpticStudio, OpticsViewer, and OpticsBuilder) are WIndows based rather than native Apple applications, so they will not be rewritten for the M1 CPU. Zemax software has worked fine with virtual machines on Apple computers in the past. However, as reported by some Zemax customers, it appears that Parallels is still in Beta on this platform, and that there is also a “preview edition” of Windows 10. Zemax uses Thales (formerly Sentinel) licensing technology which does not support preview or beta editions of Windows 10. This means even if Opticstudio installs, you cannot access a license (either a black USB key red key , green key, or software-based (softkey) lic
Sometimes, 3rd party programs can interfere with the prerequisites for OpticStudio and prevent Opticstudio from launching.  Note: Many of these programs have patches or updated releases that correct the behavior. If you have any of these programs installed on your machine, either update to the latest version of the program or remove the program and retry running OpticStudio. You should find that once the program is removed, ZOS is able to execute properly. The current list of known offenders is: NVIDIA Geforce Experience 1.6 (and some newer ones).  Adobe Acrobat 9 Pro Extended 64-bit Add-On (just the add-on, you do not need to remove the whole program) Adobe Acrobat 9 Pro Extended 32-bit (the whole program appears to be corrupt) BeyondTrust Avecto Illivid Searchqu Toolbar TrustBroker Secure Client Browserdefender PolicyPak (Client Side Extensions) Total Defense Replay Media Catcher 5.0.1.0 Cylance Antivirus RAPTR Plays TV 
What is the number of instances of OpticStudio I can open ? OpticStudio will allow you to open as many instances as your license is capable of. This section clarifies the limits for each license type and version of the software. For all OpticStudio18.9 and lower releases, the answer is always 2 instances per machine as this was built into the software. When OpticStudio19.4 came out, we also released new subscription licenses. These license types have some new and exclusive OpticStudio features, including additional instances for Professional and Premium. For those customers who have perpetual licenses and 19.4, the limit remains 2 instances for all editions of OpticStudio. If you are interested in converting to a subscription license, contact the your Zemax account manager or the sales team: https://my.zemax.com/en-US/contact-us/ See the chart below for a breakdown: Single user or network Single user or network Perpetu
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