1)How to make sure that my BTCQT is running against my custom datadir(what is datadir?)

Start bitcoin-qt with this argument:

Code:

-datadir="D:\Bitcoin"

Either run it from the command prompt or create a shortcut for it and add the argument to the shortcut's target.

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2)Isn't the latest Armory 0.96?

There's been 4 testing builds out for 0.96.1 so far. Check the release page:

https://github.com/goatpig/BitcoinArmory/releases

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3)What does boostrap the DB mean?

Initializing from scratch, i.e. no existing state/empty folder.