Question Best way to upgrade from vb 3.6.x(vbseo) to vb 4.x(dbseo) ?

[DrRag0N]

Our forums are on vbulletin 3.6.x with vbseo.
We want to upgrade forums to latest 4.x and also update to dbseo from vbseo.

How should we plan our upgrade ?
Should we upgrade to vb 4.x first and then install dbseo or vice-versa ?

Require following things setup on new vb 4.x:
Import of Zoints tags manager from vb 3.x to 4.x
Sitemaps


Thanks.