Try to convert the IDF file from V7.0 to V8.2 first before using the EPLaunch.

You can find the IDFVersionUpdater in: C:\EnergyPlusV8-2-0\PreProcess\IDFVersionUpdater\

The IDFVersionUpdater normally only compatible with limited version only.

You can download Programs for converting older version IDF files for converting much older version like V7.0.