OK Mat, that is good input for my understanding.
I shall make a copy of the latest version of my HTML file and use that to 
upgrade. If all goes well, as it should, then eventually I can delete the 
5.1.21 version. If all is not well then I still have 5.1.21.
Many thaks for clearing that up for me.
16 Apr 2020, 18:37 by [email protected]:

> Peter Buyze wrote:
>
>> So, if I understand you well, you're basically saying that if the 
>> PeterWiki-1 file gets messed up during upgrade, using PeterWiki-2 (not 
>> upgraded) will run on 5.1.21: is that correct?
>>
>
> It's not that your wiki "runs on" any version, like e.g a text document "runs 
> on" a word processor. No, instead, in single file wiki "your wiki" and the 
> stystem is integrated into a single file. So, it PeterWiki1 is really a 
> totally different file from PeterWiki2. The one has nothing to do with the 
> other. They don't share anything. Like the two files "madonna.jpg" and 
> "britneyspears.jpg". Your Peterwikis are both html files. They run in the 
> browser.
>
> <:-)
>
>
>
>
>
>
>
>
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