I'm trying to install MercurialEclipse from Eclipse Marketplace on MCUXpresso IDE 11.1.1, but it looks like it's incompatible, as many other plug-ins... Any advice?
MCUXpresso is based on Eclipse 4.12 which was released in June 2019. It looks like Mercurial Eclipse has not been updated since March 2019, so the problem lies with Mercurial on the Marketplace. There is a hint on the Mercurial Eclipse homepage that you can install from an update site (rather than Marketplace) - I have not tried this. See comments at MercurialEclipse | Eclipse Plugins, Bundles and Products - Eclipse Marketplace