The best Photoshop version for 4GB of RAM is Photoshop CS6. Photoshop CS6 is a powerful image editing software that was released in 2012. It has all of the essential features that you need to edit and create images, and it runs smoothly on computers with 4GB of RAM.

Adobe recommends at least 8GB of RAM for Photoshop, but it is possible to run Photoshop on 4GB of RAM if you are careful. Here are some tips for running Photoshop on 4GB of RAM:

• Close any other applications that you are not using before you open Photoshop.
• Use the Performance preferences to adjust the memory usage of Photoshop.
• Save your work frequently.
• Avoid using large files or complex filters.

If you find that Photoshop is running slowly on your computer, you can try upgrading to 8GB of RAM. This will give Photoshop more room to run and will improve its performance.

If you are unable to upgrade your RAM, you can still use Photoshop CS6 on your computer with 4GB of RAM. However, you may need to be more careful about how you use Photoshop and you may need to adjust the Performance preferences to improve its performance.