catalogs >= 1.5 GB cannot be installed via PARTadmin - online (->PSOL 10.0 SP0)
Please use PSOL >= 10.0 SP1 or download catalog *.cip here
http://partupdate.cadenas.de/login/index
and install "offline" with PARTadmin
open module PARTadmin -> ...-> Online
further help regarding updating catalogs by clicking F1 within PARTsolutions