Older portable versions of Faststone graphics viewer?

Does anyone have the files for Faststone Graphics viewer, from the 6.x or 5.x series? I suppose even the 4.x would be ok too.

I like to have multiple instances of Faststone running on my laptop at the same time, and I have found that when I try to open up two from the same version number (such as 7.9 and 7.5 at the same time), the second one I click on doesn't work (it doesn't open up a new instance of faststone). I currently have on my thumb drive 8.1 and 7.9. I would like one from the 6.x series, and also if available, at least one from the 5.x or 4.x series as well.

Alternately, if this activity is a bug, and say, 7.9 and 7.5 should be up and running at the same time, I'm more than willing to troubleshoot this.