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When trying to open a model from an old version of StormCAD (.STM) or SewerCAD (.SWR) , such as version 5.6, 5.5 or 5.0, the following error message is generated: "Database format not recognized or read-only. It could not be opened."
This issue can be resolved by opening the 32-bit version of StormCAD or SewerCAD V8i. You can find this by going to "C:\Program Files (x86)\Bentley\StormCAD8" (or \SewerCAD8 for SewerCAD) and double-clicking on the StormCAD.exe or SewerCAD.exe file. This will open the 32-bit version.
Once this is open, go to File > Open and select the .STM or SWR file. The model file should open without issue. Once the model file is saved in the current format, you will be able to use either the 32-bit or the 64-bit version without any problem.