Well, for the other extensions you need to provide an authorization number.
For VBA, you need to request one Obtaining your software authorization information for single-use products—Help | ArcGIS for Desktop
Check your myesri.com account in case the codes already exist. If not, request them from your customer service rep or local distributor. That should be the case whether single or concurrent use (license manager), assuming your maintenance is up to date. If not up-to-date, I'm not sure.
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