Supported Versions for Upgrade
http://documentation.arcserve.com/Arcserve-UDP/available/7.0/ENU/Bookshelf_Files/HTML/RelN/default.htm#udp_supp_vers_upgrade.htm
Arcserve UDP 7.0 Software-Compatibility Matrix
https://support.arcserve.com/s/article/Arcserve-UDP-7-0-Software-Compatibility-Matrix
Upgrade Sequence for UDP Console, RPS, and Agent
https://documentation.arcserve.com/Arcserve-UDP/Available/7.0/ENU/Bookshelf_Files/HTML/SolG/default.htm#UDPSolnGuide/udp_upgrade_seq.htm?Highlight=upgrade 
Upgrading to Arcserve UDP Version 7.0
https://documentation.arcserve.com/Arcserve-UDP/Available/7.0/ENU/Bookshelf_Files/HTML/SolG/default.htm#UDPSolnGuide/udp_upgrade_to_7.0_chap.htm?TocPath=Upgrading%2520to%2520Arcserve%2520UDP%2520Version%25207.0%257C_____0