Removing redundant code patterns within the installer.
Based on the subject provided, the most useful content addresses the context behind the search. Users looking for "highly compressed" versions of older software like Adobe Photoshop CS3 are often trying to save disk space or download time, but they face significant risks regarding malware and legality.
"Highly compressed" versions of software usually claim to reduce a 500MB+ installer to just 10MB or 50MB. While legitimate compression exists (like 7-Zip or RAR), extreme compression of complex software is often a disguise for malicious intent.
If you need the full power of Photoshop for a short project, Adobe offers a of the latest version.
You have three options to satisfy your need for old-school Photoshop without infecting your computer.