I recommend downloading LTspice while you still can. If you didn't hear the recent news Analog Devices bought LTC (the company I work for) so there is no telling if LTspice will continue being available or not. They may rename it ADspice or something, but they could also decide to just eliminate it all together. Nothing will happen for at least another 6 months to a year, but still. I would periodically visit the direct links below and keep downloading it until the final LT version is gone. Download LTspice XVII for Windows (64-bit) Download LTspice IV for Windows (32-bit) Download LTspice IV for Mac OS X 10.7+ . .