I can't believe in 2014 people still do not know how to convert FLAC to WAV.
The link here is for some free software called dBpoweramp which will convert most most music file extensions i.e. mp3, AAC. FLAC etc
Just download the files, extract it like a normal RAR and then double click the software (It is safe as I use it myself everyday)
Find the files you need to convert, click convert, go to the dropdown box and click on the WAV etc and tell it the files destination (usually the original file is the best place) and the files are then converted to WAV etc. and can be burned to a CD.