install specific version of a software with brew

Homebrew (brew.sh) has changed it's way of dealing with versioning of software packages.

the previously used brew versions formula does not work anymore. To find a specific version you first need to tap into the versioning repo with

brew tap homebrew/versions

then you can use

brew search formula

which will give you a list of available formulae which can be simply installed with

brew install homebrew/versions/formula-version