The developer explicitly warns against "shareware" or pirated versions found on third-party sites.
A search for "Zerene Stacker Professional Free Download" reveals that while the software is available for free, it is exclusively distributed as a through the official Zerene Systems website . After this period, saving images and projects is disabled, and screen images become watermarked unless a license is purchased. The Risks of Third-Party "Free" Downloads Zerene Stacker Professional Free Download
For commercial/corporate use; includes StackShot controller interface and priority support. Ability to copy EXIF data and other metadata
Flagship for advanced hobbyists; includes all technical features of Professional at a lower price. saving images and projects is disabled
Enhanced performance features like overlapping I/O with computation for faster processing.
Ability to copy EXIF data and other metadata directly from source images to the output.
Zerene Stacker uses a one-time purchase model (no subscriptions) with several tiers based on intended use. Price (USD) Key Features & Intended Use