I have autoit scripts used for my unattended install, but can i say in runonceex or somewhere, that the computer makes the windows that coming up, for the installation, are invisible?

Hope Somebody can help me!

It is possible with some installers to wait for a window and set it as invisible but normally this needs to be done with each window and Control* Functions are required to be used. It is not a good solution as the time it takes to hide the window, could have been used to click to progress to the next window.

Another concept is to move the 1st installer window off screen and each window will open off screen. Some installers are hardcoded to use the screen centre so can fail with those. Again Control functions are required for this concept.

I sometimes choose to let the windows quickly go through the cycle and hide the install progress window which tends to be visible for awhile sometimes. When Automation is required when no silent installation options available, then you can just do what is best for each installer. Either that or just go without.

How about WinSetTrans in AutoIt to 255?