Lmlarson,
JesusWept3 is correct about the license issue. You can use your current license for the upgrade, but you need to contact your Symantec Account Manager to see why you can't access the EV 10 license.
As for the upgrade, JesusWept3 is slightly incorrect. After 8.0 SP3, the DA installed version must be the same as or newer than the installed EV version. As such, your upgrade path should be
1) DA 8.0 SP3 to 8.0 SP5.
2) DA 8.0 SP5 to 9.0 SP3.
3) EV 8.0 SP3 to 9.0 SP3.
4) DA 9.0 SP3 to 10.0 SP3.
5) EV 9.0 SP3 to 10.0 SP3.
A few things to take into consideration:
1) Ensure you have plenty of free disk space for the DA Customer database's transaction log. We recommend 4 times the physical size of the DA Customer database file.
2) The less data you have to upgrade, the faster the upgrade will occur, so
--- accept or reject any searches that are in a pending state (prefer reject to remove the data froicm the database)
--- stop any exports that are running
--- if there are any cases with Analytics enabled, disable Analytics if possible.
3) Remember to backup the configuration and customer databases before starting the upgrade and after each upgrade step.
4) Also remember to allow time to run a quick set of tests after each upgrade. Something simple like running a search, reviewing the hits, and exporting some items to ensure those processes work properly.
5)When you upgrade the EV servers, install the EV binaries instead of the EV API on the DA server, please. We've had instances where not all dlls get registered with the EV API. This causes DA to not function properly.
Somewhere along the upgrade path you'll have to change to Windows Server 2008 R2, presuming you're not already running that OS on your existing servers. Once you're on EV 9.0.3, you can use the Server Migration Tool to migrate your EV servers to 64-bit hardware / OS. Follow the instructions with this tool and you should be find.
Ken