Compiling-Problems, "could not find..."

Hello again :-),

i'm so sorry to post again here. I have another problem.
I made a small test-installer to check something. A few months ago i compiled this skript and it worked.
Yesterday i have downloaded the version 2.46 of nsis and tried to compile the skript again, but i got a error message:

Processing script file: "C:\Users\q276597\ALT\InstallerTemp\Testinstaller\Skripte\testinstaller_adminrechtüberprüfung_alt.nsi"
!include: could not find: "XPUI.nsh"
Error in script "C:\Users\q276597\ALT\InstallerTemp\Testinstaller\Skripte\testinstaller_adminrechtüberprüfung_alt.nsi" on line 7 -- aborting creation process

I changed absolutely nothing at the skript, why do i get an error message?

As the compiler says, it cannot find XPUI.nsh. It needs to be either in the script's directory, in NSIS\Include, or in a directory specified with !addincludedir

Ah i should first think about it before asking for something :-)
There were different files that were not on my computer, i addet them.

Thanks a lot again