Thankyou for reaching out. We would like to know a few more details like-
- Is there any specific reason of installing Illustrator 2017 version, when we've Adobe Illustrator 2020 available?
- From where did you installed Adobe Illustrator 2017?
- Would you mind sharing the screenshot of bangla writting changed to front so that we can understand better?
Please share the information asked, however, i am also moving this post to our Adobe Illustrator community page, where our experts can help you further.