Getting macOS 10.11 to update MacVim

[ychin]

I just noticed recently that currently, on macOS 10.11 (which is quite old) you cannot update MacVim by using the built-in updater on the latest build. Doing so will result in an error. This was a result of switching from the github.com to the macvim.org domain name, which uses a Let's Encrypt certificate that macOS 10.11 doesn't recognize (the root certificate is too new and Apple has stopped updating old OS builds). When querying for updates, the Sparkle updater notices that the OS doesn't recognize the root certificate and throw an error.

If you are one of the (very) few who uses 10.11, you probably would have been seeing this issue when just browsing the web. You can follow the steps at (https://community.letsencrypt.org/t/os-x-10-11-clients-not-connecting-to-site-with-lets-encrypt-certificates/161576/10) to install the root cert used by Let's Encrypt and after doing so, the updater should work again, and you should be able to browse to https://macvim.org on Safari without issues.

If you are on 10.12 or above (which is most people), you won't see this problem at all.