Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
It sounds to me as if you are trying to skip a version, as updating V8.1 directly to V8.3. Depending on the input file, this can trip the errors you describe. When you need to update and input file from a previous version, use the transition program distributed with the software (EP Launch transition under the File menu). When skipping a version, use the multiple version updater here.
