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When using an Oracle file as the Data Source Type in ModelBuilder one of the following error occurs:
"Could not load file or assembly Bentley.EngineeringContent.Storage.Oracle.Support.dll ..."
"A supported Oracle client installation was not found on this system ..."
First, make sure you have the Oracle 11g client installed, matching the "bitness" of the version of the product you're using. You can find this under Help > About. In the lower-left corner after the version number, you will see "32-bit" or "64-bit". If you see neither, you're using a 32-bit version.
If you can confirm that the Oracle 11 client is installed, make sure you have the latest version and/or cumulative patch set applied. As of this writing, the latest version is 08.11.05.113. Contact technical support for assistance with finding the latest cumulative patch set.