UPDATES

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[quote pid="441753" dateline="1609104612"]
Now ideally I'd like to install a second copy of Bulge Gold on to my PC but......the initial installer I downloaded doesn't allow you to change the install folder? Duh? What if I renamed the folder my games currently are in as "John Tiller Software old" and ran the Bulge installer again. Will all my games in John Tiller Software old run ok now? As an old DOS/Windows 3.1 man I seem to remember lots of problems with Windows registry so I'm a bit wary trying this?
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Right click your existing folder - then paste it -- creates an entirely new game folder with all its guts - rename it to whatever you want -your suggested one would work.

Both will run fine. I do it all of the time; did it when working on a Musket and Pike project as I needed an untouched backup, one that was for the compile (without all of the junk I was working on), and one where I was just playing around with ideas ( a draft folder).  No need to run the installer. 

In my case I just let the update exes point to a c drive and copy/paste only those files I want.