I know this is an old question, but for anybody else looking for version 1.6.3.9 the links are correct but on another page I found this
‘quote’
If the U3 Launchpad version on your U3 flash drive is 1.6.1.2 or lower, unplug the drive from the PC and repeat STEP 1 once more to update to the latest version.
Step 1 being Plug in flash drive, Run LPInstaller.exe.
So installing twice with removing drive between installs gave me v1.6.3.9 showing under About in Launchpad, if that doesn’t work try a third time for good measure.
I hope that helps. Good luck.
