I would upgrade to HRP6 first (after the required backups are made). Please read the readme for HRP6 FIRST to catch the prereqs before installing HRP6. FP3 is just a bunch of individual installs. Pick and choose which ones you want/need. Webster From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf Of Minero, Hector B CIV NSWCDD, K55 Subject: [THIN] XenApp upgrade Hi all: I'm currently at PS 4.5 with PSE450W2K3R04 (Windows 2003). Since XenApp 5.0 is basically PS 4.5, can I upgrade straight to "XenApp 5 Feature Pack 3" or do I have to install "XenApp 5 Feature Pack" first?