Summary
Standalone editions of Laserfiche and the Plus CD viewer both utilize a version of the Laserfiche Server engine (LFEng.dll) to communicate with the SQL database. This means that you can potentially have two different versions of LFEng if you have both a standalone repository and a Plus CD on the same computer. This can create an issue because only one instance of LFEng can be running at a time on a computer. See the following table for more information:
| Engine Currently Running | LFEng Versions Match | LFEng Versions Do Not Match |
| Standalone | You can open a published repository. | You will receive an error if you try to open a published repository. |
| Plus CD Viewer | You can open a standalone repository; however, you will be limited to one read-only license regardless of what type of repository you open. | You will receive an error if you try to open a standalone repository. |
Resolution
If a computer contains both a standalone repository and a Plus published repository, use the following best practices when opening the appropriate repository: