Just received probably the last security update to Mojave late last week, including the Safari 14.1.2 (current) browser. I left my Late-2013 iMac running Mojave as there are 32-bit applications that I need occasional access too. They are useless, unneeded, cause havoc and interfere with the normal operation of the OS and may even Corrupt the OS requiring a Reinstallation Catalina and Big Sur Only support 64 bit and there is no workaround.Īre there any AntiVirus, Disk Cleaner, Optimizers, Un-installers, etc installed which should be removed as per Developers Instructions. Notation - Mojave is the Last version to support 32 bit applications / extensions and Drivers. Make a Time Machine Backup Before attempting.

Make sure to use Only Safari to commence the download as Others may not work How to get old versions of macOS and verify what version this computer Qualifies to install. Although, you could alway use it on your next Mac.But, this computer does Qualify for Catalina A TB3 SSD would be much faster than the USB SSD, but a lot more expensive. There are other external options for your iMac that are faster, but probably not worth the investment.

Not a big deal if this was just to get your by for a few years til your next Mac or until you got around to installing it internally. This could lead to slower speeds later on and shorter lifespan for the SSD. The biggest downside of using USB versus internal SATA besides the slightly lower speed is that there is no TRIM support for USB drives on MacOS. Overpriced when you can get a SATA SSD and enclosure for much cheaper, and have the flexibility to use that SATA SSD internally if you wanted. I wouldn't do something like the T5 unless you already had one sitting around. It is cheap, faster than your HDD, and gives you the option to one day swap it with the HDD. That is one good thing about just using a SATA SSD and a USB enclosure. Click to expand.If you end up removing the internal HDD, you might as well just up a SATA SSD in it.

Imac 27 late 2013 big sur