I was wondering if I can install Scratch program on EV3 brick without the wifi dongle.
Appreciate any insight here.
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No. Bluetooth on the computer you are using is necessary but you don't need a wifi dongle for either your computer or the ev3. If you are using the EV3+Scratch extension on scratchx.org, all you need is the scratch x plugin and a computer with Bluetooth (or a bluetooth dongle).
Here is a good article about how to set everything up.