With Filestar you can easily convert MPEG to FLAC. Accessible directly in your right click menu for single or batch MPEG processing. How to convert MPEG to FLAC:
1. Download and install the latest version of Filestar. (https://filestar.com)
2. Right click on one or more MPEG file(s) on your desktop and select Convert with Filestar.
Type "convert flac" in the search box.
3. Press Run.