If the cost of Topaz is a barrier, consider these free, open-source tools that are safe to download and often have portable versions:
Files labeled as "Portable" or "Cracked" on third-party sites are frequently used to distribute .
Can lock your personal files until a fee is paid.
Designed to grab your saved passwords and browser cookies.
They offer a full-featured trial of Topaz Photo AI (which includes the latest noise reduction tech).
A professional-grade raw developer with powerful "denoise (profiled)" modules.