If you are installing from the blue disc, you shouldn't have any problems.
But remember to right-click the install program and "Run As Administrator".
If you are installing from an older Black and White disc, there are a few extra steps to follow.
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Re: CircuitLab simulation
Simulating any part is impossible.
Ioannis Today, 20:27Either you should choose a similar one (search the included lib or other people's lib) or make your own library. There are a few ways but I never tried really do...