If you are looking for legitimate, free image denoising software, you might consider open-source alternatives like GIMP or Darktable , which offer robust noise reduction tools.

Topaz Labs offers a fully functional free trial, allowing you to test the software before purchasing.

Access to customer support for troubleshooting issues. Safe Alternatives

What are you trying to remove (e.g., high ISO grain, long-exposure noise)? Are you using RAW files or JPEGs ?