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I can't install the extension

Both of these happen when you are signed in to several Google accounts in the same browser:

  • You install the add-on from the Marketplace, but it never shows up in the sidebar or in the Extensions menu.
  • The Google authorization window (an address starting with script.google.com/accounts?authuser=1…) shows a Drive error page: Could not open file. Check the address and try again, or Page not found, instead of the list of permissions.

Google opens its authorization page for the first account you signed in with (authuser=0). When the account that installs GPT Workspace is the second or third one in the browser, the page cannot load the add-on and fails. This is a Google limitation, not something we can change in the add-on: the same thing happens with every Apps Script add-on.

Solution, pick one:

  1. Sign out of the other accounts. Click your avatar in the top right of Google, choose Sign out of all accounts, then sign in with only the account you want to use with GPT Workspace. Install or open the add-on again.
  2. Use a dedicated Chrome profile for that account. Open a new spreadsheet in it and install the add-on from the Workspace Marketplace.
  3. Use an incognito window. Sign in with the one account there and install the add-on. It is then installed on the account, so it also appears in your normal window once that account is the first one.

After the install, open Extensions ➤ GPT Workspace ➤ ▶️ Start in the file, accept the permissions, and reload the page.