Can't help you with the downloading, unless you mean by legitimately buying for it. Openly facilitating pirating here is quite against the rules. Because DMCA Takedown Notices and the core of this community have a bad history.
As for which translation program to use...
I use a combination of <<
www.hongfire.com/forum/sh...-new-text-extraction-tool|ITH>> and <<
www.hongfire.com/forum/sh...slation-Aggregator-v0-4-9|Translation Aggregator>>. ITH automatically reads and copies the kanji from the game, feeding it via the clipboard to TA, which automatically translates the kanji using various online services of choice (Google Translate, Babelfish, etc.).
They're a real pain to set up properly, and even if you do, the translations will still be naturally terrible and require a lot of guesswork on your part to understand their meanings. But it's better than nothing, and it's the best way I know of to get translations of eroges.