I am using Delphi XE IDE. I create a notifier to implement IOTACompileNotifier. After install the expert in the IDE. The code works fine when I compile my project. The n
error code "Read of address 00000000" can indicate that you are trying to access a resource which does not exist. I saw that you've asked the same question on the Embarcadero forum. From what I saw on here on SO, there are only several developers who are interested on OTA, the documentation from CG or Embarcadero is almost inexistent, so I'm suggesting you to insist on Embarcadero's forum.
best regards,
Radu