Hello Zemaxers!
OpticStudio 19.4 SP2 is now live on our website. You can download it here:
http://downloads.zemax.com/Downloads/ZOS19.4_2019-07-31_SP2.exe
This service pack release contains mostly bug fixes. The release notes are here:
https://my.zemax.com/OpticStudio-downloads/release-notes/OpticStudio19-4-SP2_ReleaseNotes.pdf
Happy ray tracing!