followed your instructions and same error as shown in my earlier image.
Also please note that at no time was i ever prompted to enter a serial number as in the earlier versions when i tried to create a form. I was able to get WA to prompt for a serial number by calling on another application within the DB extension.
I looked for WATrigger.js in the Scripts folder that the error called out and it is not there. Was your installation supposed to create it? I looked for other similar issues in the past under your help history and there was an instance that a .version release was required to correct this issue.