When trying to open a model files, a message is displayed that that file could not be found that appears to point toward the temp directory. The message is similar to:
C:\Users\(user name)\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\xxxxxxx\model.stsw.sqlite
It is possible that the model file is not completely downloaded to an accessible drive, such as the local hard drive. First, browse to where the model is saved and make sure the files are not read-only and that they are available. If the models are saved to a network drive, try copying them to the local hard drive and opening them from there. It might also be helpful to clean out your %TEMP% folder and then try opening the model.
If that doesn't work, try importing the database file into a new model file by opening the program and then selecting File > Import > StormCAD (or other program name) database.