I can answer one of those.
The "Unavailable technology" was probably the result of having the AI attempt to trade you a racial tech that you did not have. For example, if it had Crystalline Technology knowledge, and you didn't choose it in the beginning of the game, it would probably show up as Unavailable since there is no way for an empire to aquire technology from a race with a racial tech unless they already have that tech.
I apologize for my confusing and somewhat awkward reply, I'm quite tired right now
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