@Tharris1530 MAG series would support only till 8.X range, hence the max version that you can upgrade the MAG device is 8.3R7.1 code. 8.3R7.1 has the following security patch - https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44101
No more security updates will be released for MAG as 8.X codes are End of Life.
NOTE: There has been other security patches released which cannot be installed on MAG platforms, hence the general recommendation is to do a hardware upgrade (PSA appliances) which can support the latest security patches released by Ivanti.
# Security update are generally in the form of firmware package, hence you would need to just upgrade to the device to that version, no special instructions.
Cluster upgrade - https://www-prev.pulsesecure.net/download/techpubs/current/420/pulse-connect-secure/pcs/8.3rx/How_To...
Standalone upgrade - https://www-prev.pulsesecure.net/download/techpubs/current/431/pulse-connect-secure/pcs/8.3rx/How_To...
Certificate installation KB - https://kb.pulsesecure.net/articles/Pulse_Secure_Article/KB22288/?kA1j0000000FjLV
Pulse Connect Secure Certified Expert