The program downloaded and installed prefectly. I opened the program and a prompt was displayed asking to enter the product registration key. I then selected the evaluate button, then the main screen appeared. After entering in all the information, I selected the compute button. A second prompt was the displayed. It was a small window containing a exclamation point and nothing else. After seeing this, I noticed the calculation had not been completed. After repeating the process two times, the compute button became unavailable. It seems the programmers included a fail safe, limit the times you can use it to two, then prevent them from using it twice, only option left, buy the product to actually use it. I for one feel this is false advertisement. Personaly, i wouldn't suggest buying this product, as there is no gaurantee it even works.