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I upgraded but need to do a clean install, how do I re-download Catalina, Software update won't seem to let me?

Recently upgraded to Sierra and everything (everything) except FaceTime is working. And the malfunction isn't consistent. The FaceTime icon is greyed out on most of my contacts but not for a few. iMessage, iCloud, Bluetooth, wireless, sound, sleep, wake, etc.. are working flawlessly. Any...

Initially (Unibeast 1.5) when I tried to update OSX 10.7.4 I suffered loss of USB. Unibeast version 1.5 apparently was flawed with respect to inserting the IOUSBRollback option. I remedied this via using Multibeast to install the rollback on my Unibeast thumbdrive. This got me through 99.9%...

...for a total of 8GB. Now the system boots until loading OS and then turns off and reboots normally. In BIOS the ram is recognized as being in the slot but only slots 1&2 are "enabled" for a total of 4096 MB, although once booted in the system profiler recognizes all the RAM at the correct...