Yes. While the app’s license agreement has changed, downloading a version that was previously freely distributed on Google Play is not piracy—provided you do not bypass any payment walls. Version 3.2.5.5 was always free.
is the last stable release from the “pre-bloatware” era. Released in late 2015/early 2016, this version represents the final build before the developers aggressively integrated lock screen ads, “phone boosters,” app managers, and data-hungry background processes.