Normally trial version will reset with every release. Meaning if you try 2020, with 2021 you'll have the option to try again. The only thing I see as a reason is some regional lock, or information stored in an account...
@karanjam_yandex, based on your name I have determined your region to be Turkey, excuse me if I am wrong.
You can download it from here:
Ücretsiz Antivirus | Trend Micro
You might need to create a new account (that's the way to go around Kaspersky trial). In that case you can try download it from the original post.
This is the only thing I see as solution. Unfortunately I have my license, maybe other users using this trial can help.