The landlord unloaded it uncleanly. The 20 13 I downloaded from the internet was marked with the education version, but it was marked when printed, which had no effect on other functions.

The way to remove the mark is to save the drawing file in dxf format, and then open dxf and save it as an educational version in dwg format. The mark is gone, but I hope I can help you.

I can't help you with this, the original should be gone!