How i can make .dst file from ai? How i can download software free?

Converting an Ai file to DST or any other machine embroidery format isn’t simple as you think.

It’s not just like converting JPEG to PNG or any other. Instead of that it requires manual digitizing process which takes time + effort + techniques.

If you want to do it yourself then you have to get:

1.       Embroidery digitizing software (like wilcom or pulse which are expensive)
2.       Essential skill of machine embroidery digitizing (takes time to learn)

and then you will be able to convert a picture to DST format. Mostly I use these guys https://zeedigitizing.com for my embroidery need. May help

my digitized horse photo

Did you look at this thread over in the Illustrator forum: ___ How do I convert an Ai logo to a .dst file for use in embroidery?