Users search for a license file (often a .avastlic file) intended to trick Avast Premier 2018 into believing it is activated until 2050.
Here is the "proper story" regarding this specific type of request:
Using cracked software like arquivo-de-licenca-do-avast-premier-2018-crack-ate-2050 presents extreme security risks, often serving as a trojan horse for malware, ransomware, or spyware.
Such "cracks" are rarely legitimate licenses. They are usually modified files bundled with malicious code. By installing them, you effectively lower your computer's defenses.
Instead of protection, users often get keyloggers (stealing passwords), ransomware (locking files for payment), or cryptojackers (using your CPU to mine cryptocurrency), often rendering the computer slow or unusable.