Hi,
Do you mean 34811a or 33120a?
And for which operation system?
For windows I use this softwarebundle with my hp 33120a:
A software, called: "FuncGen_25Aug_a.exe". This is the main install software package.
You also need the agilent/keysight IOLibSuite with an Agilent USB-GPIB Converter or a NI card with the NI driver. (I am not sure what is necessary for communicatian via serial link)
Further there is a plugin for pulses, "WFE_PulseAddin and a pattern editor called PatternEditorInstall_4.0msi".
This sofware is rather old, but is still working, even with the latest Windows 10 64bit version.