Hi Iwona, Getting an old Adobe Illustrator ME (Middle Eastern version) is not possible any more, you may subscribe to Adobe CC though to get access to full ME capabilities. Another thought, is to stay on your CS5, and use a utility enables you to type Arabic in that utility, copy text and paste it in Illustrator, having said that, you will not have good right-to-left controls as you would in the Middle Eastern version. Here are options of the utilities… Scribe door arPIX Pro << this works with its own Arabic fonts only, the fonts are nice.
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