smf to xenForo

how to migrate from SMF to vbulletin to then migrate to XenForo?
I installed vbulletin 3.8

You use their import software called ImpEx. But I had trouble with the latest version of ImpEx and vB3. They apparently changed some stuff for vB4 and broke the old target. So I always import into vB4 as the intermediate.
where I can download vbulletin to XenForo importer?
when I try to download it from here:

I get error:
XenForo Community - Error

You do not have permission to view this page or perform this action.

Once you have purchased a license, to receive support + downloads you will need to link your forum account to your license.

You can do that in the Forum Users section of the Customer Area here:
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