The best way to upgrade the remote agent in this situation is "Local Install"
1 : Copy 2 folders form the backup exec server to the remote server in a new folder..namely :
RAWS32 and MSXML for 32-bit remote server and RAWSx64 and MXSML for 64-bit server
2 : Cope the command prompt and navigate to RAWS32 / RAWSx64 folder...
3 : For 32-bit server run setupaa.cmd...example : C:\AGENT\RAWS32\>setupaa.cmd
4 : For 64-bit server run setupaa64.cmd in the RAWSx64 folder
5 : For AOFO run setupaofo.cmd....