Anyway, in Elric, you'll find the Texture Conversion section in the middle part of the left column. At the top, you'll see "Force Format" and here you can set the DDS format of your choice. Check the "Generate MipMaps", and keep the "Quartering Threshold" and "BC7 Threshold" to "NONE". "Quartering" here means it would create a smaller resolution out of a larger one (Input 4k -> Output 2k, for example). Elric can batch convert TGA files to DDS.