Problem with SpreadSheet install.

This is on a project that has been working with localization, suddenly stopped.

Cvita:
I2 Localization 2.8.1 requires a new WebService (v5). There has been several modifications to speed up the Google Translations and allow for batching way more translations requests.
That means, that the WebService you installed for a previous version of the plugin will not longer work.
To fix this, you need to click the "Install" button again, to create a new copy of the webservice in your Google Drive, then use the new URL.
After that, the WebService should verify correctly.

I have investigated a little further, and it seems to crash in LocalizationEditor_Spreadsheet_Google.cs when retrieving the version number at function OnVerifyGoogleService : int version = int.Parse (data["script_version"]);

Are you sure its a crash, or just the error saying that the version number is not valid, so the webService can't be verified. ("Unable to access the WebService")?
If its a crash, can you please, send me the exact log you see in the console, that may give me an idea why its failing for you.
If its just the "Unable to access the WebService" error, then it means that
- the WebService can't be access (check unity has permission to access the network),
- The webService is an old version (v4 or previous), in which case, you need to delete it and reinstall it
- The Authorization didn't complete correctly.

One thing, to notice, is that with some recent changes to Google, they are now showing all deployed google apps as "unverified". You may receive a google warning saying "This app isn't verified", when you do, you need to click "Show Advanced" and then "Go to Copy of I2GoogleWebServiceV5 (unsafe)", that will resume the authorization process.

Sorry about that inconvenience, I applied a while ago and I'm still waiting for Google to "verify" my webService. Will have to contact them again to speed that up!!

Another thing that maybe happening, is that if you have several google accounts open at the same time (work & personal), you may need to logout of both, and log only on the one you are going to install the WebService. (this is may only be needed when installing, to guarantee that you don't start the process on one account, but the permisions are conflicting with the other one).

After installed, you can log into both account without issues.

Hope that helps,
Frank

Today Unity approved v2.8.1!!
That version uses the WebService v5 and has tons of improvements and fixes!

If you can update and the issue persists, please, let me know exactly what steps you do so that I can try it myself to reproduce your problem.
Hope that helps,
Frank