Error Code 5013 indicates that you are out of product activations. When you purchase PlanGuru you receive one activation for each machine license you have purchased. If you purchased PlanGuru Network Version, you receive one activation per network seat you purchase.
If you would like to move your license from one machine to another, you can simply deactivate the license on the machine you were previously using PlanGuru on and activate the product on the new machine. To deactivate a license go to Help>Deactivate License. You will then be able to use this activation on the new machine that you wish to run PlanGuru on.