As an existing customer, if you are upgrading to the current release, you must run a post-install script manually through the developer console. 

List<echosign_dev1__SIGN_Agreement__c> lstAgreements = [SELECT Id,
														echosign_dev1__Attachment_ID_Order2__c,
														echosign_dev1__Attachment_ID_Order__c
														FROM echosign_dev1__SIGN_Agreement__c
														WHERE echosign_dev1__Status__c != 'Signed'];

if(!lstAgreements.isEmpty()) {
	for(echosign_dev1__SIGN_Agreement__c agmt : lstAgreements) {
		agmt.echosign_dev1__Attachment_ID_Order2__c = agmt.echosign_dev1__Attachment_ID_Order__c;
	}
	update lstAgreements;
}
CODE