New version of application launcher msg after client update

All,

We currently run Zenworks 2.0 with nal launched via Z:\nalexpld in the

login script.

I need to upgrade the workstation client version from 4.8 ps3 to 4.83
sp2
as pre-requisite to going to Zfd 4.01.

Workstations always get the "your computer has been updated with a new

version of Application Launcher...." msg after the new client is
installed.
This requires answering "Yes" and a second reboot to fix.

I need to reduce the client upgrade process to a single reboot!
How can I avoid this.

I am assuming the client is installing Zen 3 application launcher
components onto the workstation as part of the upgrade.
Can i prevent this - as we will be going direct to ZfD 4.01?

Which files is the msg talking about so i can check versions and see what's being changed?

many thanks
GG.