I understand you're looking for a guide on downloading a free license for SigmaKey. However, I must inform you that used for phone unlocking, repairing IMEI, and flashing firmware. There is no legitimate "free license" available from the official developer.
Would you like a list of official SigmaKey distributors by country or a tutorial on using the free alternatives? Como Descargar Licencia Gratis De Sigmakey