The following message explains how to upgrade/hack the Rigol DP800 series, DL3000 series, and DG1000Z series.
https://www.eevblog.com/forum/testgear/need-help-hacking-dp832-for-multicolour-option/msg4028779/#msg4028779 May be same procedure applies to the DP932U. To understand if the keys work you can try just first two steps (which enables LAN option permanently).
If those steps work there is a big chance that the rest of the procedure also will.
I am writing down those steps also here:
1- Go to:
http://gotroot.ca/rigol/riglol/. Enter your power supply's serial number in the Serial box. Enter "
F6LT" in the Options box. Click Generate.
2- On your power supply, go to:
Utility → Option → Install. Enter the code generated in the previous step, and press OK. The LAN option should say "Official". Turn off the power supply.
3- Turn on and check options if the LAN option is enabled.