Qiita download with no raw data

I have downloaded the folder ‘All QIIME Maps and BIOM’ from Qiita. However, I do not understand the structure of the downloaded folders. It has 3 subfolders:

BIOM - many BIOM and seqs.fa files (with different number ID’s)
mapping_files - many mapping files (with different number ID’s)
processed_data

What do these files represent? Which ones do I use to do analyses like the ‘Moving Pictures’ tutorial (mainly with sequences, barcodes, and mapping file/metadata)?

This is where I downloaded the data, which is not a very big folder:
https://qiita.ucsd.edu/study/description/10376

Many thanks for your help!

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