Elastic beatgrids are useful for Beatjumps, Autoloops, FX and of cource BeatMatch
This guide explains how to emulate Elastic Beatgrids for free, using Traktor
https://pestrela.github.io/dj_kb/traktor_elastic_beatgrids/#how-to-emulate-elastic-beatgrids-in-traktor
This is a more accuarte workflow:
https://pestrela.github.io/dj_kb/traktor_elastic_beatgrids/#how-to-emulate-elastic-beatgrids-in-traktor-more-complex-workflow