How to Install Form Builder for Docs
Form Builder for Docs is available in Google Workspace Marketplace
You can install Form Builder for Docs in 2 ways.
Create a new Google Doc or open any of your Google Doc.
Now click on "Add-on" option from the menu .
Then click on "Get Add-on" option from the menu
search for "Form Builder for Docs"
Select Form Builder for Docs from the search result and click on Domain Install or Individual Install
It will take you to the Authentication window and select your account
Click Allow that will complete your Authentication process.
That's It. your installation process is Completed.
Directly reach the add-on using this link in Google Workspace Marketplace Form Builder for Docs at Google Workspace Marketplace
Click on "DOMAIN/INDIVIDUAL INSTALL" button
Follow the steps above.