I am an amateur user, I have about 50 individual MP3 files of and incident that are chronological in order. I would like to make one file that will play them in a row non stop. I was able to download all of them to one file but didn’t realize they all play simultaneously. Any help for a simpleton would be very greatly appreicated 
If the files are named in alpha-numeric order, the tracks should be in order (top to bottom) when imported into Audacity.
If the order is not correct, it will probably be easiest to rename them before you import them so that they are in the correct order (the “earliest” part as the top track, and the final part as the bottom track).
When you have imported them all in the correct order:
- “Ctrl + A” to select all tracks
- “Tracks menu > Align Tracks > Align End to End”
- File menu > Export > … (whichever export option you want)
Note that to export in MP3 format requires that LAME is installed (https://manual.audacityteam.org/man/installing_and_updating_audacity_on_windows.html#winlame).
Note that the maximum size for a standard WAV file is 4 GB, which is equivalent to about 6.8 hours of CD-quality audio (44.1 kHz, 16-bit stereo).
Help with playing multiple MP3 in a row
FYI - Windows Media Player can sort and play by (alphanumeric) title or by track number ([u]embedded metadata[/u]). Some players can sort/play by file name, but I don’t know how to that in Windows Media Player.
When I converted a couple of audiobooks to MP3 I renamed the files, prefixing with the chapter number, plus I used the Track Number metadata field as the chapter number.
Personally, I’d use [u]Mp3Tag[/u] for metadata editing because it opens a folder-full of files at once and you can enter/edit the common data once (typically the album name or the name of the book , artist, year, genre, etc.) and then edit the track numbers & title names one-at-a-time.