HPE offers no Community Edition or Free Trial edition of their hyperconverged software. This is in part due to the fact that HPE SimpliVity 380 uses a hardware accelerator card for deduplication/compression.
However, HPE maintains a cloud-based evaluation environment in which demos can be conducted and where potential customers can load up their own workloads to execute Proof-of-Concepts. This is called the Cloud Technology Showcase (CTS).