You can install VCS 5.0 on a single node. You can subsequently add another node to the single-node cluster to form a multinode cluster. You can also prepare a single node cluster for addition into a multi-node cluster. Single node clusters can be used for testing as well.
You can install VCS onto a single node using the installer program or you can add it manually.
See Creating a single-node cluster using the installer program
See Creating a single-node cluster manually