i have completed the migration from inno setup to IA and it works perfectly now.
I didnt used the converter, I rebuild the project.
Now my customer is really angry because the install speed is very bad:
1. Loading process until first welcome dialog:
Inno: 6 seconds
IA: 31 seconds!
2. Install progress:
Inno: 15 seconds
IA: 48 seconds
How can we improve the speed? I tried all compression levels, but it is very slow.

LOADCACHE is also TRUE.
Do you have any idea? Would be nice