@tgodfrey wrote earlier:

my having a 301 redirect on the primary domain to point to a sub-directory, which I need to have.

Why? Why don't you install b2evolution at the root of your webserver?

That's how it's designed to work and to be hassle free.

Yes. The thing is that in order to avoid being pestered by people who want to know why their site isn't working - you know, like when you click a button in Word and a page appears - I've fallen into using subdirectories. So I set up a new site on upgrading, and then change the redirect. A private experience, like.

But having tried to utilise multi-domain a few times and never succeeded, I can see what you mean.

So right now I have an install in /015, and I'm doing an install in the root. But because of the 301 redirect I am taken to the old /015 install. I would like to keep the /015 site live while I mess about.

Trying to run 2 instances of b2evolution, one being in a sub directory of the other will create additional problems.

If you want to test you should do it with completely different domains and a separate (temporary) web hosting account. Short of that you are creating your own pain.

Sorry, I should explain: I'm doing this as a preliminary to moving the site to the root.When I get the / site working OK, I'll delete the /015. I wanted to do an update, but to keep it simple for the moment I'll move the /015 site to / by using the backup files, install with the /015 database and convert to utf8, then delete the /015 install. And remove the redirect.

Then try the multi-domain setup where it should be.