2016 Word 15.14 update issue saving docx files

I have posted in the MS community and the first response told me to update to High Sierra, but with all the problems I've been seeing others with earlier iMacs like mine having, I don't want to update until they're resolved. It doesn't make sense either. Below are the pop up messages I get; the first is when I open Word, the other two when I close it.

Kappy...please do your best to bear with me here. If you look at the screen shot of the disk you'll see there's no Home folder as you mention. When I close the good document, then go File>New Document, then Save as "Normal.dotm" I have to select a file format which I asked before. Instead of saving it as a .docx file do I save it as .dotm file? I asked before but I guess it slipped through the cracks. I'm in the SF area, Pacific time zone, 415-637-4011. Thanks. Jonathan

As stated this is what opens when I to a Save As for the new document named "Normal.dotm" below. I doubt it makes sense to save it as both. Do I understand correctly that by saving it this new document using the drop down selecting the '.dotm' file format, we're creating a new template to replace the corrupt one or? I never created one to my knowledge in the first place, LOL

Having posted another discussion on the Microsoft forum, a different solution was offered. Opening Word preferences, then selecting File Locations>User templates>Modify I can see 3 of them; normal, normal.dotm, normal 2. The member states you rename them, but in my case, they're grayed out so when I click on them, nothing happens. At least I was able to find the user templates you mentioned. Sure is frustrating though.

Kappy..so you understand a bit better, after updating to 15.40, I clicked on a .docx file on my desktop, worked on it and when closing it, a global template window popped open which I'd never seen before. Not knowing what to do I might have done a save, which has obviously caused a problem, though I'm not sure why the global template warning opened in the first place. In answer to your question, when I open Word and see the first screen I obviously click "OK". The other two I click "Don't save". I'm not sure how to get the the /Home/Library/Applications Support/ folder since I've only been using Mac for a few months and have no idea where to input it.

Kappy, thanks. Some questions surface due to unfamiliarity with some of these processes on a Mac. I have two documents saved in .docx file format on my desktop now. Since I've been working on one of them I imagine this would be the document you refer to in the first steps, correct? I can assure you that when I go to close it I will be barraged with prompts about the global template thing. Wouldn't it be better just to open a new document while the other is still open? Also when you say I should save the name of the document as "Normat.dotm" this is confusing since that's the file format I'm constantly being prompted about; please clarify. In addition, where do I find the directory to copy/paste: /Users/your_account/Library/Application Support/Microsoft/User Templates/ ?? And where is the Home folder you refer to located? Sorry I'm only about 4 mos or less using Mac so I haven't learned some of the deeper elements of the OS. Finally I'm wondering after doing the process and checking the 'show library folder' box, what happens then? Sorry I'm wanting to figure out the logic in the process so I understand more clearly. I'm a former tech exec though not from engineering or software so I enjoy learning anything new. Thanks. Jonathan

Both of the documents on my desktop have been saved using the .docx file format. I just saved them again and was prompted asking if I wanted to replace and clicked 'yes'. Oddly when I opened the first one, I did not get prompted with the global template windows. There is no desktop icon for the disk drive on my system though when I click on Finder, under Devices it shows 2 listings; one with an iMac icon which has been named and another with the disk icon named 'untitled'. I've tried to copy/paste the disk icon but it won't let me. What shall I do now?

Also going back to the previous message where you say I should close the two .docx documents then open a new one naming it 'normal.dotm' do I save it in .docx file format?? Sorry for all of this but I've never encountered this with Word before when using Windows. Thanks for all your help

Navigating with my mouse to the Microsoft folder, inside it there's no folder with User templates only one maned MAU2.0 and inside that one it shows an icon with Microsoft AutoUpdate, nothing else. Pressing command J, the window opens but its missing the show library and others I see in the screen shot of yours; not sure why

Kappy...on my iMac 'untitled' is the disk drive since it was never given a name, nor do I know how to. When I open Finder preferences and check the box to show the disk, the disk icon says 'untitled' beneath it, so obviously its the right one. As to the previous answer you posted, you're saying that when prompted, I should save the "Normal.dotm" template as a .docx file? Sorry but this is challenging to say the VERY least.