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I am using the beta now. I have been using Catalina since the developer betas and haven’t had major issues on my MacBook Pro.
That maybe so., but I myself would never trust a beta version for my day-to-day processing. And especially when there is nothing in the new version of the Mac OS that is "earth shattering". Even for one of my critical apps, SuperDuper!, is still too "risky" for me. The latest beta of it seems stable, but not yet for me. As it is, there is still one more critical app, TechTool Pro, that is not yet compatible with Catalina, and there is no beta version of it yet (as far as I can tell).

I'll just let other folks test out Catalina until SuperDuper! and TechTool Pro are completely compatible. Mojave easily satisfies my needs, and is stable.
 
I am running Catalina on three systems, one running the latest beta and two running 10.15.1. No problems.

Waiting for 10.15.2 may be a sound strategy, but you may also want to consider if you want to switch to some other tools if the developer have problems delivering.

I used this opportunity to ditch Adobe Creative Cloud.
 
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I am running Catalina on three systems, one running the latest beta and two running 10.15.1. No problems.
I actually have OS 10.15.1 installed on an external Samsung 860 EVO 500 gig SSD, and yes, I also am having no issues. But it is not wise for me to completely "move" to Catalina from Mojave, given that two of my most critical applications, SuperDuper! (making backups) and TechTool Pro (performing disk cleanup/maintenance/repairs), are not yet compatible with Catalina. And again there is nothing "earth shattering" that I must have in Catalina. Mojave is just fine for me.

As of now, given that it will be (most likely) a few more weeks (maybe as late as January) that TechTool Pro will have a Catalina-compatible version ready (SuperDuper! is much, much closer), I suspect I'll be testing OS 10.15.2 when it is released (maybe soon?) on that external SSD.
 
If the GPU doesn't have drivers in Mojave you will probably run into issues.
Im so far beyond pizzed off with Catalina, I can barely hold my termper. I have a iMac 2019 (yeeeukk T2!!) which has stalled on OS load for reasons unknown. I have also a MBP 2016 running "catalina" aka *****!! In addition I also have a 2012 MBP running Sierra.

I can not get catalina to download a copy of Mojave, because the OS is too old, I can not download a copy through my 2012 MBP because it's too new. i need to boot my iMac to you guessed it "Mojave" to see its a prblenm I can resolve via external boot. Guess what those "****WITS at "APPLE" have done, made it impossible for me to it with anything other than a Mojave system running 10.14.6. A weekend of spare time virtually wasted trying to resolve a seemingly insolvable issue. I cant open the iMac because I'm not sure what will happen if I remove the drive (can it be done at all?) clean it and reinstall it...

Attach your own descripotion of Apple designers etc here, because English simply does not have enough words to describe them right now IMHO!!

Maybe I'm wrong, perhaps you can advise a way around..

Sorry for the hijack..
 
"I have a iMac 2019 (yeeeukk T2!!) which has stalled on OS load for reasons unknown. "

2019 iMacs (other than the iMac Pro) DO NOT HAVE a t2 chip inside.
I have your "pathway forward".
Whether you choose to follow it... is up to you.

Here's what you need to do:
a. Get an EXTERNAL DRIVE. It can be either platter-based or an SSD. An SSD will work MUCH better.

b. Once you have that, connect it to the 2016 Macbook and open Disk Utility. ERASE the external drive to APFS, GUID partition format.

c. Take the external drive to the iMac.

d. POWER OFF the iMac and connect the external drive

e. Press the power-on button and IMMEDIATELY hold down this key combination:
Shift-OPTION-Command-R
This should invoke the OS installer for the version of the OS that came with the iMac (High Sierra or Mojave, I think).

f. Do the OS utilities load?
If so, this was an important step. Do this next:

g. Open the OS installer and begin "clicking through". HOWEVER....

h. When the OS installer asks WHERE you want to install, "aim it" AT THE EXTERNAL DRIVE. Then let it go.

i. This will involve one or more reboots, the screen may go black for a little, and it will take time. BE PATIENT.

j. When done, you should see the initial setup screen (choose your language). Set up a basic account on the external drive. DO NOT BOTHER with iCloud, email, or anything like that. All you want is a username and password.

IF YOU CAN GET THIS FAR, you now will have a bootable external drive with either High Sierra or Mojave on it. IF YOU CAN GET THIS FAR, you should now be able to "go to work" on the iMac's internal drive and get it right again.

This is your pathway forward.
PRINT THIS OUT and check it off as you go along.
 
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