See related link for versions history and detailed explanations about changes.
6.0
The version of Photoshop that is right for you depends on your specific needs and budget. Consider factors such as the features you require, your level of expertise, and how often you will use the software. Adobe offers different versions of Photoshop, such as Photoshop Elements for beginners and Photoshop CC for professionals. Evaluate your needs and choose the version that best suits your requirements.
Adobe Photoshop CS3 is most user friendly but if you use any of the version of adobe Photoshop then you will also feel user friendliness slowly slowly for the same versions which are used by you.
Photoshop Elements provides nearly the same functionality of the full version. It is neither easier nor more difficult to use.
If you edit your question with what version you use, I will try to help you
Photoshop CS5
Maybe CS3? It is version of Photoshop
Adobe Photoshop CS6
Adobe Photoshop CS5
Yes, iMac can use 8bf plugins with Photoshop, as long as you have the compatible version of Photoshop installed. The 8bf plugins are typically designed for Windows, but many of them can be run on macOS using a compatible version of Photoshop. It's important to ensure that the specific plugin supports macOS and is properly installed in the Photoshop plugins folder. Always check the plugin's documentation for compatibility details.
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The most current version of Adobe Photoshop can be found at www.adobe.com