Silver v5.5 offers a 30-day trial. For continued use:

Warning: Do not use keygens or cracks. They often contain cryptocurrency miners and will trigger Windows Security.

Once you have successfully completed the download Silver v5.5 for Windows step, follow this installation procedure.

Microsoft never released Silverlight 5.5. The last version is 5.1.50918.0.
If a website asks for “Silverlight 5.5,” it may be a scam or a misnamed internal build.

Malware often masquerades as Silver v5.5. Before running the installer, verify the file’s checksum.