Read the EEC using the 4bank.xls strategy, then try to flash that same calibration to see if it asks for tokens or not

You must purchase a license for the Mongoose so BE will enable it to read/write. If you already did you're good to go.
BE asks for credits when you try to flash using the mongoose, no way to flash...

To read the calibration you need to load the correct strategy, yes. A lot of errors will pop if you don't. There is a blank strategy made by Decipha just to read the EEC and save the file, I attached...

Yes I use it. Very good software, pricey but good.
AFAIK, coyote tuning is not yet released into BE. It will be released soon