DVDVideoSoft offers a free standalone utility to convert FLAC files to MP3 format. It’s called “FreeAudio Converter”. You do not need to download or install the suite to get this standalone utility. I tested v 5.0.30 with several albums I had in FLAC format and it works well and is very easy to use.
A big warning, their installer is riddled with extra installs. Be very careful while installing to select the custom options to avoid installing some bloatware on your computer.
I did find a bug while converting two albums. The output filenames were truncated. After examining in detail I finally found the issue. The files names had a period after the track number which truncated the converted MP3 filenames. I had to use my favorite tool, Total Commander, to delete the period after the track names so that the converter would properly carry over the full file name.
Once I converted the files, the list of files remains in the window. It took me second to discover if you right click in the window there is a selection called “Remove all” from the selection window.
There are options to change the output filename, but I found no need to use that feature. There is a wide variety of output quality formats to choose from. VBR, 32-320kbit and VBR Lame. It also supports a wide variety of formats besides MP3 like Wav, M4A and M4A. You can also create a M3U playlist during the conversion.