I started using SMath Studio with the creator's promise that the program would always be free to access. Unfortunately, this premise is no longer completely fulfilled. Although I can still use the program for free, there are add-ons available only in the paid version, such as Region Modeler, for which there is not even a tutorial available. I've spent a lot of time figuring out how to use it, but now I feel like I should have spent that time learning another program. The lack of guarantee that SMath Solver will remain free is discouraging. This situation disappoints me and discourages me from continuing to use and recommend this program. I hope that the program's original vision of being free to access becomes a reality again.