Hey! Thanks for asking - been a while since I made this one so had to go back and look at what I'd done:
For tracks marked **, whilst the standalone versions are all different lengths the loopable versions provided within the download are equal in length to allow for crossfading as you describe.
For the others - the loopable version of Battle Commences should be exactly twice the length of Battle Ceases, so the loops line up after one full cycle of Battle Commences.
This looks like it lines up with the files I've got saved locally, but please let me know if there ends up being any issue - if I can track down the original projects I'd be more than happy to fix!