Each file is structured in a 4-level hierarchy structure to make folder navigation easier.

For example,
HRGMv2_20XX/                        ← Level 1 (group of 100s)
    └── HRGMv2_204X/                ← Level 2 (group of 10s)
        └── HRGMv2_2049/            ← Level 3
            ├── GENOME059508.fna.gz ← Level 4 (actual file)
            ├── GENOME064710.fna.gz
            └── ...
        └── HRGMv2_2049.tar.gz

A bulk download can be availble at "Download".