M4uhd.tv is not an official distributor. It streams copyrighted content without a license from movie studios (Disney, Warner Bros, Universal, etc.). In most jurisdictions (USA, UK, EU), streaming from such sites exists in a legal grey zone, but downloading is often explicitly illegal.
— M4uhd.tv is known for intrusive pop-up ads and redirects. Downloaded content eliminates these interruptions entirely.
Most unlicensed sites and their associated "free" downloaders are high-risk environments for malware and adware.