Hi Rik, I think you mean 08.11.09.03 and there is no method to completely uninstall a program except using third party tools to perform an uninstall. What you need to check is whether you have the following files in the extracted Prerequisites folder VBAOF11.MSI and VBAOF11I.MSI. If not then the prerequisites are not fully extracted. If you do have them than install them manually and to start AECOsim to see if you still get the message. HTH Nasir
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