The downloaded launcher update file is 2.03 MB. System is windows XP with service pack 2, 32 bit. The error message is: Installer integrity check has failed. I downloaded the launcher update on another computor, same type of system with service pack 3. It installed the update normally as far as I can tell. So I tried tranfering the download to the computor with service pack 2, but I get the same error message when trying to apply the v2.4 launcher update.