Section 46E. A license issued under section forty-six D shall not be assigned or transferred without the prior written approval of the commissioner. Application for such approval shall be made in the same manner as an application for a license, as provided in sections forty-six C and forty-six D. The location of an employment agency shall not be changed without the prior written consent of the commissioner and such change of location shall be endorsed upon the license. More than one such license may be issued to the same person. If an applicant desires to establish or keep and employment agency at more than one location, he must apply for a license for each location at which he intends to conduct said employment agency, as provided in section forty-six C.