Will I get any Waves Community Tokens if I hold my WAVES on Bittrex ? If not, how can I get them ? do I have to download a WAVES wallet or something ?
No, first you need to send them into Lite client and keep it at least till 15-16 of each month.
Latest version of Waves clients: Lite client
(0.4.8) Chrome App
(0.4.8a) +
Tutorials