Ich hatte vor einiger Zeit mal das gleiche Problem. Hab dann im Internet folgendes gefunden (die Quelle ist nicht mehr erreichbar):
FrameWork 3.5 offline installer (231MB) It works!!
Ok, I was fustrated when I tried to install this 231MB (offline), beacuse it needed 10MB. But I checked the log file dd_dotnetfx35install.txt, reading that I found the next line:
“Cannot access file: X:\dotnetfx35\wcu\dotNetFramework\dotnetfx35langpack_x86es.exe”
That file is just language pack, so after installer downloaded dotnetfx35langpack_x86es.exe (35MB) the installation was finished successfully. (I know, is not a offline way)
I did this:
I copied dotnetfx35langpack_x86es.exe (My language pack), to:
dotnetfx35\wcu\dotNetFramework\dotNetFX35\x86 (as a result of decompressing the dotnetfx35.exe).
I probed this new method in virtual Pc, another installation without Internet conexion and It works.
Also Languagepack (DE oder entsprechend) extra laden und entsprechend reinkopieren. (Falls es das ist was er bei dir laden will)