If you need to build out a lab environment options are still available to you
The first is there is a large amount of available software from Microsoft running in Evaluation mode freely accessible here.
If you are looking for previous versions of the software (such as Windows 7 or Server 2008 R2) you can access them from this page.
Would you be interested that there is a free solution from the Technet Script Repository to help spin up those environments far more quickly using ONLY the Free Hyper-V Server 2012 R2?
It’s available for download now and with it you can quickly spin up the operating System and even a Domain controller with minimal effort (Without evening knowing how to spin up a Domain Controller)
If you have comments or feedback let me know and I’ll try to improve upon it’s design and use.