Hi folks - my name is Pete, I work at ActiveState and just wanted to quickly note that the above answer is roughly correct. We support PPM access for versions of ActivePerl that we are currently shipping CE (Community Edition) for, with a bit of a buffer when new versions come out (so there will be a period where older CE versions will retain access to PPM). Currently, those versions are 5.24.1 and 5.22.3 so I would venture to say that for an older version like 5.16 you won't be able to access PPM modules for install without a BE (Business Edition) license. PPM is available for all versions with BE.
Hope that helps! Feel free to ping me if you ever have questions.