The author of mix marginnotes with marginpars without overlap is/was interested in a certain loss of functionality from one version of the
marginfix package to the next. Out of interest and curiosity I wanted to see what this
blockmargin environment was all about. However, only the most up-to-date versions of packages are available for download from most repositories.
Is there an archive of historical versions of packages available (on CTAN, perhaps)? Hopefully something similar to this historical, stable version archive of
beamer. Or is this all left up to the package authors? And I doubt whether Wayback Machine would be that good a place to start...
I am not planning on using the older version, since they may have deprecated functionality that does not interface well with other packages.