Problem with LyXWin144Small-2-10.exe after upgrading to MikTex 2.5

[Marius Disler]

Hello

I tried to upgrade MikTex to version 2.5. As a result pdflatex in LyX 
version LyXWin144Small-2-10.exe didn't work anymore. There was an error 
message that LyX couldn't find the pdf-file in the temp-directory. 
Therefore I reinstalled the old Miktex 2.4.1705. Now the koma-script 
classes aren't there anymore in the lyX-menu. The koma-script package is 
installed in TeX, as I could verify via the MikTeX package manager.

I would be very thankful for any help.

Thanks