Legacy Plugin (2011, 2014, 2015) SDK and references install

Hi I am new to the SDL developers community.  I was recently asked to work on a plugin project for legacy SDL Trados and have a few questions:

 

0.1) Am I posting this in the right forum?

1) The plugin I was asked to work on was an existing plugin which has been abandoned.  While I was able to compile it for the 2014 version by installing the 30 day trial of Trados, is there a nuget package for legacy references?  Or is there any other way to get these dll's other than installing trial versions?

2) Is there a way to properly take over an abandoned plugin and update the version in the AppStore?

3) I can't seem to find any documentation for legacy sdk except in zip format.  Is there an online version?

 

Thanks for your help, I really do hate being the new guy with too many questions, but I am told my contribution is a pretty important one for translators.

Sam Lombardo (AweSam.Net)