How to Disable the "Update" and "Register" option?
1. Trace the "autoupdater.exe" component in the provided MSI/MST.
2. Delete the "autoupdater.exe" file from it, marking one of the HKCU entries as the keypath so as to avoid ICE errors.
3. Dont delete the whole component as it contains language specific XML files which gives leads to application giving error when launched.
This will grey out the "Update" and "Register" option from application as well as prevent it from auto-updating.