Unfortunately Micro - Cap 9 is no longer available for download. It was recently updated to Micro - Cap 11. Taking into consideration the information that are provided on developer page, the demo version of Micro-Cap has no time limit of using. In its demo version this application comes with some restrictions like: equation count (nodes+sources+inductors) < 75, component count < 50 components (all layers), anywhere from 0 to 300% slower than the professional, limited component library, no Model program, and some of the advanced features are not available. Also, if you want to try the full version with all features available you can buy it directly from developer page, and if you are not satisfied with the functionality of this product in 30 days, the company will give your money back.