From ALT Linux Wiki
Sisyphus is quite dynamic project which makes it hard to schedule and perform releases based on it. To overcome this system of branches was invented: Sisyphus is regularely branched creating a new repository which is then stabilized for several months. Resulting repository is called a branch and can be used as a basis for distributions and solutions.
Every branch is an APT repository containing source and binary RPM packages along with metadata.
See p7/t7 and above via downloads; "p" (platform) ones are officially supported by ALT Linux Ltd and "t" (team) ones are supported by ALT Linux Team members.