Setting the control to Enabled = False has very little effect on the AutomaticUpdater. A bulk of the code still runs, however the UI is disabled. So don't use that property.
AutomaticUpdater1.ForceCheckForUpdate()
Don't call ForceCheckForUPdate() in the contructor of your form. Also, don't dynamically create the AutomaticUpdater -- just create it at design time.
Error: Invoke or BeginInvoke cannot be called on a control until the window handle has been created.
This has been solved in the next version of the AutomaticUpdater. You can download the latest trunk of the AutomaticUpdater (r116 is best -- if you don't have SVN you can download the source using this tool).