After upgrading from Kentico 6.0, through 7.0, to 8.0.18, our online form widget stopped working. There error on the page says: "Failed to load widget object. The file '/CMSWebParts/BizForms/bizform.ascx' does not exist." Indeed, it doesn't. Should it? Or is something else wrong?
Usually when I encounter issues like that I stand up a brand new version 8 site with the same hotfix and then look and see if that file should exist. If it does, I copy it over, otherwise, I replace the webpart with a different one.
It should exist.
Either do like Joshua said, or try to import the upgrade package.
I did what Joshua said. It works now. Weird. These upgrades have been a harrowing experience.
Please, sign in to be able to submit a new answer.