Whether or not you can get a Maine sales agent license depends on the nature of the convictions. Generally, anything that impacts your ability to competently and honestly engage in real estate brokerage activities can be grounds for denial by Maine Real Estate Commission.
The Maine Real Estate Commission considers the criminal history record on a case-by-case basis. The MREC will deny licenses for convictions of any Class A, B, or C crime. Denial can happen if the conviction involves dishonesty or false statements or directly relates to the occupation.
Your prior criminal history will be revealed when the Maine Real Estate Commission runs your criminal history record. You should enclose documents in your license application related to the conviction and why you should be approved for the license.