Perforce not selectable in Unity Pro 4

We have Unity Pro license already and trying to set up the version control.

However both perforce and asset server not selectable…

I thought we need a team license like Unity used to do it, but in their website they said it’s already included in Pro license. Any idea of that?

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ok i think i featured it out… for Unity 4 we still need the team license.

but I don’t find anywhere to buy it anymore, leaving the options to upgrade Unity 5 or contact sale team I guess