How do I install LTspice XVII?
Go to http://www.analog.com and download the file LTspiceXVII.exe into a temporary directory on your PC.
Execute the file LTspiceXVII.exe to install. You will need to run this as Administrator.
The download file, LTspiceXVII.exe, is digitally signed by Linear Technology Corporation.
I downloaded the LTspice installation program, but it tells me that it's not compatible with the version of Windows I'm running. Can I get a copy that will run under my Windows version?
You need to be using Windows 7, 8 or 10. Windows XP1 won't run LTspice XVII. If you are using Windows 7, 8 or 10 and got a error message about the installation file, LTspiceXVII.exe, then it got corrupted during download. This can happen if the file on the server is revised(due to web site maintenance) while you're downloading it with a slow connection. You'll have to download it anew. Windows 7 x64 currently is the most popular platform for LTspice XVII.
1] LTspice IV is still available for Windows XP users, but LTspice IV is no longer being updated.