. Because ArcaOS is a commercial product based on IBM OS/2, "verified" downloads are only available through authorized personalized builds rather than public mirrors. 1. Purchase or Upgrade License : Purchase a license for the ArcaOS 5.1 Personal Edition or Commercial Edition. Existing Users : If you have a 5.0 license, you can upgrade to 5.1 at a discount through your customer portal Support Subscription

: It supports the GUID Partition Table (GPT) layout, allowing for installation on modern disks larger than 2TB.

: The OS is currently available in English, German, Spanish, and Russian.

The only way to guarantee a "verified" and "malware-free" ISO is to purchase a license directly from Arca Noae. Once you purchase a Personal or Commercial edition, the ISO is custom-generated for you and made available in your account's "My Downloads" section. 2. Digital Signatures and Checksums