Just make a copy in a safe directory of :
resumeinfo.txt
hostlist.txt
templist.txt
these are located in the "install" folder of XOlox

make also a copy of your partial downloads (temp) "xlx files"

unistall Xolox and install the new build. (dont forget to use the "same" folders as you did before!!!!)

copy your saved files to their directories (overwriting)

I prefer to erase also the "registry-key" before installing the new version.

Greetzzz

You don't need to uninstall up perform that upgrade.