go to the NI instrument driver page and find your instrument
download from the driver site (in fact a Keysight page)
unzip into your LabVIEW version instr.lib (somewhere in program files or program files (x86) under national instruments.
make sure you unzip in a folder name like agtn57xxor something.
restart LabVIEW and they should be in the menu.
greetings from the Netherlands