how do i contact legacy system extension for up date
how do i contact legacy system for up date
Question marked as
See this Apple article:
About legacy system extensions - Apple Support
It is all up to the developers, not the end user. The only action you can take is to contact the support people for third-party apps you see reported. I've already found that Logitech is working on compatible app versions for their mice and keyboards.
Apple apps will be ready before the new OS is released.