Error When Installing Citrix Rollups "the installation source for this product is not available"

error "the installation source for this product is not available. Verify that the source exists and that you can access it."

Resolution:
extract contents of rollup and run the install again.

to extract the contents of a rollup
open a command prompt
msiexec.exe /p" c:\location of folder with rolluppack\rolluppackname.msp" /a"c:\location of folder with MPS\MetaFrame Presentation Server\MPS.msi"