It has been a busy summer...

Back in June, it looked like I could upgrade to Threads from my old 6.3.1.2 forum without an intermediate upgrade of Classic. But now all I see is
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UBB.classicâ„¢ users. Please note, if you are not running at least version 6.7, you will need to upgrade your forum to 6.7 at the minimum before importing to version 7.

and so I look at the UBB.Classic v6.7.3 download, and first thing, there are two versions to choose, but no hint as to which one I should download. Back in June, there was a lot more info online, and it seems to be gone now.

Can I still get to the old online help, or do I just ask one question at a time here?

Next question: I downloaded one of the "Current Version: 6.7.3" zip files and open the ReadMeFirst.txt and find:
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NOTE: If you are upgrading an existing licensed board, you need to download the "upgrade" release zip from the Member Area. This is a full installation zip, which is only suitable for new installations or upgrades from the UBB.classic(tm) Trial Version.

Where is the upgrade release?