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If this article has convinced you to hunt down Adobe Photoshop CS3 Extended, here is the reality check:
Because Adobe killed the activation servers, some users argue CS3 is abandonware. Legally, it is not. You still need a valid serial number. However, for historical and educational purposes, museums and archives often maintain CS3 Extended rigs to preserve 3D art created in that era.
Before CS3 Extended, editing a 3D model’s texture involved exporting UV maps, editing in Photoshop, re-importing, and re-rendering. CS3 Extended changed that.