This page lists the known errata in documentation shipped with ArcaOS.
ArcaOS 5.0 Installation Guide
3 Burning the ArcaOS ISO Image to DVD
Page 7, second paragraph:
You may have received your copy of ArcaOS as a 7z-compressed archive. This archive contains the ArcaOS ISO image, together with a file containing the checksum of the image. In order to create the ArcaOS Installation DVD, the archive must first be unpacked. After unpacking, it is wise to verify the integrity of the ISO image by running a checksum on it, and comparing that to the checksum listed in the accompanying checksum file, which it should match.
should be changed to read:
You may have received your copy of ArcaOS as a 7z-compressed archive. This archive contains the ArcaOS ISO image which must first be unpacked.