I think you are asking about ESXi free edition and license edition. ESXi free edition has limited features, and will work as standalone ESXi server. Licensed edition has various edition, and each has various features. Here is the link that details all
"Free edition" After (60 days) you must license the host when the evaluation mode expired, after (60 days) it won't crash shut down or stop working but you won't be able to add or create new VMs until the real license is applied. Seems like you enjoy the product for (60 days) but eventually if you want to do more you must purchase the license.
So for your purpose I would recommend some low cost effective license
Virtualization for Small Businesses - vSphere Essentials Kit
License Over View
LINK: Download VMware vSphere Hypervisor for Free
VMware VDI Administrator.
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