I'm wondering if anyone else that has a Mac ever gets a message that says "Legacy System Extension" Existing software on your system loaded a system Extension signed by "Symantec" which will be incompatible with a future version of MacOS ?
Yes. I'm running MacOS 10.15.5 and waiting to install the latest upgrade for MacOS. This morning I accepted the invitation for a free Upgrade to NortonLifeLock and tried to download and install it, but get there error message that a newer version of Norton is already installed. Huh
John v