Whoever owns a vBulletin license can also install a second "test" copy for which they can use to test mods or other things. This copy just needs to be blocked from the public- most often accomplished with an .htaccess password.
So any license holder can create their test copy and give access to a developer or someone they know interested in creating or testing mods on it. There is no need to pay for a 2nd account.
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