I've been getting this same issue "Mystic Light - Install failed." as well as "Devices Speed Up - Install failed." for the last 3 patches.
Mystic Light still works fine, it just hasn't been able to update for about a month now.
I've got a Z690 EDGE Wifi DDR4 with an i12900k.
I just updated to the last MSI Center patch that just came out today, and still the same issue persists.
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Ironically I had just purchased and installed a 16TB Seagate external HDD, and I thought that had something to do with why the update failed
up until today when I searched and found this thread.