Looks possible, this is one solution I never saw. Everything said I had to reinstall W10. Will try this evening or sometime this weekend and report back on success.
This will be runner up, it is not something I tried.
Thanks to all.
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I can again see the video. Then writing again if i missunderstanding on video from youtube. So he sayed he first logoff security boot and installation fail. Then he logon Secureboot and used repair installation and everything working. Security boot automation is setting - Zorin find this function and asking for safety password for security boot.
Back in august i installed zorin with secure boot turned on, it worked fine but it needed extra keys for manual nvidia installation.
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Reads: not for beginners.
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Indeed...even for me it was 
. Disabled secure boot back then and it worked fine. Even windows 10 booted without it.
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I've never enabled secure-boot.
I installed and used Windows 7, 10, 11 all fine.
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Thank you so much. This worked. I've searched changing an MBR W10 install to UEFI off and on for a year and everything I found said I would have to reinstall. I use this computer to trade with and I'm serious about the configuration being just right, I didn't want to do the work to reinstall. The conversion suggested work easily and perfectly. I installed Z16 one more time, UEFI and all is well. Now I can begin the long slow process of configuring Z16 before switching to it permanently.
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Wonderful! Enjoy Zorin like all of us...
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Before you proceed further may I suggest you to create a disk image so that you can recover form any catastrophe in the future?
Clonezilla (CUI) <- Rescuezilla based on this
Rescuezilla (GUI) <-easy for beginners
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I did create a system image using the onboard (win7) backup and restore. You know, the one that never works when you try to use it. 
Maybe I'll give your idea a try, after all, the last one worked pretty good.
I am not so sure if you can use this software to backup the Linux partition. Windows is unable to read ext4 (Linux file format).
Clonezilla/Resuezilla can read/write almost any file format.
When I was using Hackintosh, I used it to backup my macOS disk (HFS+ format).
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I haven't got anything I want backed up on my Z16 install yet. I have a couple of problems to solve before it can be my go to system. I've got to learn the RTD commands and different formulas for Calc so I can do away with Excel and I have a small bit of software written by a colleague in Python and using SQL server that I find real useful, don't know how that is going to work in Linux. I've got time.
The back up is not for the data.
It is for your system.
If anything goes wrong you have to repeat the installation process from scratch unless you have a disc image backup.
I guess that's what I was saying, reinstalling Z16 is a breeze, I've done it so many times. But I don't really have it configured yet so nothing to lose. But that is the fun part, figuring it out. All the data is presently on W10 which is backed up six ways from Sunday. I get to play with Z16 till Monday, then back to reality during the day.
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Ah, OK.
So after the heavy customization, you will make a backup.That makes sense.
Funny thing is that I can install Linux much faster than Windows. No need to flip CDs for driver installation in Linux 
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No comparison. W10 install is a half day minimum, before any customization. I really appreciate the help. I'll be back hammering away at this tomorrow night or Sunday. Got more turkey to eat tomorrow.
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I boot Zorin in Legacy and Windows in UEFI. Here's why you're having your problem. When you are booting up, you are booting up with the UEFI boot setting turned on in your BIOS. As Windows is your only UEFI system installed, it will therefore boot to Windows. However, if you go into your BIOS settings and change the boot type to Legacy, it will boot up your Zorin installation. I didn't see this answer in this thread so I thought I would add it. As far as I'm aware I've had no problems, and because I rarely use my Windows side it's not very inconvenient at all
Thanks for this additional info.
While this is a workable solution, going into BIOS every time to change OS could be a bit too much for some who use both Windows and Linux on a daily bases.
I still think it is simpler to convert Windows installation from Legacy to UEFI in a long run. It is a single liner in the Windows (administrator) terminal:
mbr2gpt /convert /allowfullOS
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Yes as most post here are looking for a fast and easy way to resolve issues. Much like they did in that awful M$ product.
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