easm to sat conversion is typically searched by users that are looking for a way to export SolidWorks' eDrawings (.easm) to 3D ACIS model format, something that is actually not possible.
eDrawings are used a preview only way to share/publish designs and except for few unique exceptions, there is no way how to convert these files to some other format. If you want to export the design, you have to obtain the source file, in this case the .sldasm assembly file.
Updated: October 24, 2023