What is the best thing to do when the " LEGACY SYSTEM EXTENSION'
What is the best thing to do when the "Legacy System Extension" message appears on my MAC screen?
iMac 21.5″, macOS 10.15
No need to worry, but to see them, just don't upgrade to 10.16 if the developers don't have updates...
About this Mac>System Report>Software>Extensions, click on Obtained from Header, all that aren't Apple are Legacy.