Nice Stewi.
Upon checking the official NVDA addons site, I found the following:
IMPORTANT NOTICE: Add-on temporarily unavailable
Due to changes to the service the add-on uses, Instant Translate add-on is temporarily unavailable. Sorry for the inconvenience. If you wish to help the add-on author, please use the development version and ask on the NVDA community add-ons mailing list. Thank you.
NVDA Community add-ons team
I personally am not subscribed to that list, but you might consider sending an email to the contact addresses in the add-on itself.
I'd also suggest you put this somewhere like github, I've been thinking about messing with it for a while now but never did find it's public repo (if it's even in one)
Regards,
Blademan
Twitter: @bladehunter2213