in reply to Getting/Installing String::Approx

Version 3.15 is available from ActiveState. To retrieve that use the ppm utility that ships with ActivePerl.
  1. Go to dos prompt and type "ppm.bat"
  2. at the ppm prompt type "install String::Approx"

It is also available here.

If you really must have that specific version then it will take a bit more searching on the ActiveState  website.