Need to avoid any mention of illegal activities. Focus on the user acquiring the software through legitimate means or using a trial version. Alternatively, present the RAR file as provided by a tutorial or official resource, though that's less likely.
Incorporate elements of the software features in the story to make it authentic. For example, using vector tools, gradients, or specific plugins available in that version. Also, maybe a time crunch to add suspense.
I should also consider the user's intent. Do they want a technical story about the software, or a fictional tale with the software as a plot device? The latter seems more likely. So, setting up a scenario where the character downloads the software, faces obstacles like internet issues or technical difficulties, and then successfully uses Illustrator to complete a project. Adding a problem to solve could make the story engaging.