On an iMac and a Macbook, both running macOS Sierra 10.12.6, I have installed the latest LTspice IV (Build Oct 3 2016, 14:49:11 US Pacific), which prompts me to update on launch. Attempting to do so via either the Model Update or Software Update buttons in the Operation tab causes the spinning wheel for about 10 minutes before finally crashing with EXC_BAD_ACCESS (SIGSEGV).
On Windows I had similar issues when behind a proxy, but there are no such Internet shenanigans here.
Does anyone know a way to update LTspice IV on macOS? I'm happy to do it manually via ~/Library/Application Support/LTspice if necessary.
Best Answer
LTSpice for macOS has finally been updated to LTspice XVII as of October 25th, 2018. I have verified that it has resolved the model update bug, as well as most other noticeable issues that had cropped up in the last release.
So the updated answer to this question is to simply download the latest version - it fixes the model update crash and many other issues as well. Even the icons have been tweaked.
The new URL (since Linear Technology has since become part of Analog Devices) to download the latest LTSpice version (I would be surprised if the self-update function worked, given the change) is here.