J901 systems are available for nonavx, AVX, and AVX2 hardware (see Guides/AVX). The initial installation is non-AVX and finishing the installation steps will upgrade to AVX or AVX2 as appropriate.
Download and Install
Most Windows users should use All-in-One.
Linux users who want a debian package should use Debian.
Android users should use apk.
All other users should use zips.