Well the fun just keeps rolling in with the newest R update and ensuing package updates. Two new issues have just been brought to my attention that prevent new installations of ENMTools: first, the newest version of phyloclim no longer exports the "descendants" function, which ENMTools uses. There's a hot fix for that on the develop branch of ENMTools on Github, where I basically just copied the code over from phyloclim for the time being so it no longer has to be imported.
The second issue is a bit more of a hassle: ecospat has been removed from CRAN, and I'm not sure why. Given that ENMTools requires ecospat to run, this is a bit of an issue. For now, all you can really do is install ecospat manually from the Github mirror of the CRAN repository, and then install ENMTools after that. Hopefully ecospat will get updated and re-uploaded to CRAN soon, but failing that we might need to find a more permanent workaround eventually.