When upgrading from one version of portable DocFetcher Pro or from one version of DocFetcher Server to a newer version, do not unpack the new version on top of the old version. This will get program files mixed up, potentially causing abnormal program behavior. Here's the correct way to upgrade the program and also keep your settings and indexes: Unpack the new program version to a fresh location. Copy only the folders conf and indexes from the old program folder to the new program folder. Copy from the old program folder to the new program folder any files you modified by hand. Note: If you're using non-portable DocFetcher Pro, then on Windows (and only on Windows) you can safely install the new program version in the same folder as the existing version (e.g., C:\\Program Files\\DocFetcher Pro). This is safe because the installer will automatically remove the existing version before installing the new one. The installer will also retain any existing settings and indexes. On platforms other than Windows, non-portable DocFetcher Pro must be unpacked to a fresh location, and it will reuse any existing settings and indexes in your home folder. As for DocFetcher Server, all release files of DocFetcher Server are portable, so the above upgrade procedure for portable releases applies.