The download page at SpringSource (http://spring.io/tools/ggts/all) doesn't seem to make previous versions of GGTS available, but I want to have this version to be able to toggle between the Groovy 2.0.7 and Groovy 2.1.8 compilers.
As a potential solution, I searched for mirrors, but was unable to find any. In addition, I also checked GitHub for the GGTS source for this release so I could compile it myself, but I didn't find that either.