Software Deployment

I've been asked to update a local installation of the SAP GUI 620 on our workstations with the following two SAP GUI 620 Patches:

SETUP620_14-10001502.EXE
GUI620_44-10001502.EXE

I'll distrbute the patches via SMS and they must run silently.

Problem 1) When I run with the command line %ProgramFilesDir%\SAPPC\NetInst\SAPSETUP.EXE" /Patch:"%PathToPatch%\SEM31A.EXE" /SILENT - I get "The Patch file setupxxxx...exe could not be opened. Please make sure the file exists and is a vaid SAP Front-End-Patch."

I have verified the paths and know that the .exe files are good because I can install them just by running them, whch leads to...

Problem 2) I cannot find a "Silent" switch for these to EXE files.

Any help is greatly appreciated. Thanks in advance!
Tim