The crackle is due to skipping: intermittently tiny pieces (~1ms) are missing, (audio intermittently interrupted by another process on the computer), this usually causes discontinuity, which is the click/crackle …
There is a DeClicker plugin for Audacity which will repair the clicks, but it can’t put back the missing parts, so not a cure … /uploads/default/original/2X/1/15582f57ca49a7e57cd6594ed68b5d533f28d47a.wav