I don't own a 2488, but isn't information on exporting master tracks in your owner manual section that explains how to Import & Export?
That's section 10 in the 2488 Neo OM on line at the TASCAM support site:
Exporting Master Tracks
You can export one or more master tracks to a computer. The master tracks must all reside on the same TASCAM partition. Master tracks are converted to stereo WAV files, and sent to the FAT partition, from where they can be copied to the computer. Regardless of the master track bit depth, the exported stereo WAV file is 16-bit.
The 2488 Neo manual lists 9 steps to accomplish the export.