ExecWait + InstallShield v11 and v12 question

[o_owd]

Hello,

I have a problem with my installer. Actually the problem is not ExecWait. Let me explain.

I have my installer (NSIS) that must wait for a InstallShield setup and an update for that InstallShield setup. The update is InstallShield. I have three installers like this. Two of them must wait for v11 InstallShield and the third for a v12 InstallShield.
When I run my installer from the HDD everything works as it should. ExecWait works.
If I try the same thing from a CD/DVD it does not work.
Probably InstallShield launches a new process because it cannot write anything on the CD/DVD.?! Anyway, this is my logic.
As I said, I do not believe it is a ExecWait problem.

What can I do ? I searched in TEMP folder after I started the InstallShield setup and I cannot find any .msi file.

Sorry for the long post and sorry for my english.
Thanks in advance,
OJi.