You can download v10d from the Veritas site. it will accept all your v10 serials, but you should update all the Remote Agents that you have have installed.
v10 here
http://seer.support.veritas.com/docs/279330.htm
Go to the Software downloads page http://support.veritas.com/menu_ddProduct_BEWNT_view_DOWNLOAD.htm and filter for "v10d" and "patch" to see if you need to download and install any of the HotFixes