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Hello guys.
I want to buy new adaptere for my computer. I am planning to buy this one TP-LINK AC600 Archer T2UH and I have some question about it:

1) I am using Windows 10 and I saw this adapter is not compatible with windows 10 but actually I am using WN722N and it is not too but it's working so, may AC600 Archer T2UH too?
2) The most I need this adapter to play games (especially League of Legends), my friend told me that the best is to have 5GHz (not 2,4Ghz how I have in WN722N) because I have just high ping many times. Can AC600 Archer T2UH help me?
3) I saw on this adapter I can have 2,4 GHz or 5 GHz - I can change it. And I am really "green" on things like this (so it can be stupid question): Is it hard to change it?

Thanks for any anwers :)