make sure you cleared the old installation from your computer,
by going to software deinstallation, deinstall the mxl launcher from sigma
redownload it,
find the correct spot for the installation, incase your D2 directory, where you want to put the installation in
and follow the steps with the installer
if there comes an error,
you did something wrong in the steps to install it correctly,
then it is better to start new
and delete old directories before
i recommend clearing any registry from last hours from failed mxl sigma installations first
there is an app data directory, it gets the launcher information aswell, make sure, that you delete all before try to new install it
its in the admin app data directories, in the end its called Median XL
you can find all stuff by using the programm: Everything
its an searching programm, very good for using
try to find all Median XL directories and sort them out, that have been created today, delete them
then start over a new installation from scratch
best regards