@mwbeauregard I’ve contacted you through the DM’s, please check your inbox
FYI: My M200 plus is back and running again! 
What I did was that I updated the firmware with version 1.1.2 first.
Then I was able to further update to versions 1.2.0 → 1.3.0 → 1.4.0 → 1.5.0 → 2.0
What I noticed was that the unzipped version 1.1.2 file has a *.zar extension, while the subsequent firmware versions were all *.zar2 files. I wonder if that is the reason why it initially did not work out to update with version 1.2.0.
@DamianZortrax also mentioned that the fact that I was using a Mac to unzip files could be a potential source of error. So I unpacked all files on a Windows machine.
In hindsight I can’t really tell which was the factor to success in updating - windows vs starting with version 1.1.2 or maybe both? Anyways, thanks again to @DamianZortrax for providing me with the archived firmware versions and for the excellent support! 
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I’m glad I could help ya! 
I’ll be looking into “unzipping on Mac” issue in the future. Let me know if you need any more help.
Hi, I need version 1.1.2 firmware for my Zortrax M200 Plus. Can you help me?
Thanks you a lot!
Hi, you can get that from here: Firmware - Zortrax