Yeah, crappy problem, it happened in March too. Well I think a newer version is up and that's why this one stopped working.

Same here, it broke while I was playing bk3 rofl.

Hi Socheat. I'm using 3.0 too. Could you post please the link you've downloaded it from? I've downloaded it from its original source, directly through the developers' website. But well, when did you last use the add-on? All of this may help us to know the cause of this sudden issue. We aren't the only person who couldn't run the add-on, many other friends of mine couldn't too.
Regards!

Hello,
The same here, this must have happened very recently because on Friday it was working fine.

I've downloaded the latest instant translate from the main developers website, but when I want to translate something it still nothing.
what should I do?

Ok, as I got the mail from addon mailing list, maybe google translate has moved a bit too far from the Instant translate. I mean, google has updated some translation status. so, the instant translate doesn't work anymore.

Maybe we'll have to wait til the developers code some stuff for it to make it compatible with the new google translate changes.

Hello.
I have bad news. Google API is now fee, so the complement of instant translate not work anymore until further notice ..
I hit them the talk of the complement of the NVDA mailing list.
>> > ***
>> > [nvda-addons] Re: Out for a time Alberto Buffolino
>> > [email protected] 11:47
>> > Noelia (il 28/07/2015 08.27) ha scritto:
>> > 1. About InstantTranslate
>> > (developed by Mesar (the file contining the Translator class which
>> > produce errors, Alberto, Beqa and others) I think that unfortunately
>> > this add-on doesn't work since Google api is available as a paid
>> > service:
>> > Alberto:
>> > Hi Noelia,
>> > I'm afraid so. I think to migrate add-on on another translation service,
>> > if possible, but I have to do some tests.
>> > Alberto
>> > Hi,
>> > I'll do it as part of the maintenance day routines in one sitting.
>> Thanks.
>> > In regards to Instant Translate, that's a huge loss if that is true...
>> > We may need to alert others then.
>> > Cheers,
>> > Joseph
>> > -----Original Message-----
>> > From: [email protected]
>> > [mailto:[email protected]] On Behalf Of Noelia
>> > Sent: Monday, July 27, 2015 11:27 PM
>> > To: [email protected]
>> > Subject: [nvda-addons] Out for a time
>> > Hi, sorry for my intermitent availability. About Joseph planification
>> > for releasing add-ons on august 1, I won't be available this day, and I
>> > don't know when I will be able to continue working on add-ons.
>> > Befor this I report the following:
>> > 1. About InstantTranslate (developed by Mesar (the file contining the
>> > Translator class which produce errors, Alberto, Beqa and others) I think
>> > that unfortunately this add-on doesn't work since Google api is
>> > available as a paid service:
>> > https://cloud.google.com/translate/docs
>> > About add-ons contributed by me and others:
>> > 1. ReadFeeds contains the right code to prevent issues with non latin
>> > characters; it's on stable branch and I didn't know or remember this. So
>> > the minor version with translations updates sould be done.
>> > 2. Emoticons 4.0 could be released merging master into stable.
>> > 3. PlaceMarkers and eMule add-ons can be released increasing the minor
>> > version since they contain translations updates.
>> > I can do this today or some of you can do it on August 1.
>> > Thanks.
>> > NVDA add-ons: A list to discuss add-on code enhancements and for
>> > reporting bugs.
>> > Community addons are available from: http://addons.nvda-project.org To
>> > send a message to the list: [email protected] To change your
>> > list settings/unsubscribe: http://www.freelists.org/list/nvda-addons
>> > To contact list moderators: [email protected]
>> > NVDA add-ons: A list to discuss add-on code enhancements and for
>> > reporting bugs.
>> > Community addons are available from: http://addons.nvda-project.org
>> > To send a message to the list: [email protected]
>> > To change your list settings/unsubscribe:
>> > http://www.freelists.org/list/nvda-addons
>> > To contact list moderators: [email protected]

Or they make a clone of it but instead translating to other services, like, if it is implemented in the instant translate submenu or options that makes a translation for other services, it is the same as q translate.