I got the zip version kidcnote of it and then the zip plugin version too.
That way if any newer version comes out I just delete the files in the XnView and unzip the new version there.
Then if all works ok I deleted the pass version zip.
I always keep the zip around of what ever version I have because if you get the newer version and it does not work right I can always go back to the last version.
Still lots of things in XnView I don't know how to do but I like it.
Another program is Graphic Workshop.
Got a older version I can even run from a zip. I did have to install it but then I just copied the folder to a zip. Now if I run it, it works and it just adds a .ini to the windows folder that remembers your settings
http://www.mindworkshop.com/alchemy/gwspro.html
I did not have the Pro version. The Pro version was new back then. The one I had was shareware and he hee when you close the program it said "please register Graphic Workshop". It still works so time never ran out on it.
But that was years ago. So do not know if there software is still like that.
Do not see the older version at there site anymore.