Below are the minimum OfficeScan versions required for upgrading to OfficeScan 11.0/XG:

• OfficeScan 11.0 GM (SP1 | Critical Patch 4150 | Critical Patch 6054)
• OfficeScan 10.6 GM (Service Pack 3 CP5495 | Service Pack 3 CP5900)
• OfficeScan 10.5 Patch 5
• OfficeScan 10.0 Service Pack 1 Patch 5

The following are the upgrade paths:

• From within OfficeScan 11.0:
  • OfficeScan 11.0 GM
  • OfficeScan 11.0 Service Pack 1
  • OfficeScan 11.0 Service Pack 1 Critical Patch 4150
  • OfficeScan 11.0 Service Pack 1 Critical Patch 6054
  • OfficeScan XG GM
• From OfficeScan 10.6 GM:
  • OfficeScan 10.6 GM
  • OfficeScan 11.0 GM
  • OfficeScan XG GM
• From OfficeScan 10.5 GM:
  • OfficeScan 10.5 GM
  • OfficeScan 10.6 GM
  • OfficeScan 11.0 GM
  • OfficeScan XG GM
• From OfficeScan 10.0 GM:
  • OfficeScan 10.0 GM
  • OfficeScan 10.6 GM
  • OfficeScan 11.0 GM
  • OfficeScan XG GM
• From OfficeScan 8.0 Service Pack 1:
  • OfficeScan 8.0 Service Pack 1
  • OfficeScan 10.6 GM
  • OfficeScan 11.0 GM
  • OfficeScan XG GM
• From OfficeScan 8.0:
  • OfficeScan 8.0 GM
  • OfficeScan 10.5
  • OfficeScan 10.6 GM
  • OfficeScan 11.0 GM
  • OfficeScan XG GM

The latest versions are avalaible at the Download Center.