Who is the developer of Legacy System?
How can I delete the Legacy System?
Mac Pro
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They are normal if you wish to do more than OSX comes with.
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.
How did this get into my MAC?
Who is the developer of Legacy System?