Today Sitecore 8 was released. There is so much cool stuff packed in this release. The Sitecore community was rightfully excited to get their hands on it. But before you can use it you must install it.
I am a big fan of the Sitecore Instance Manager (also known as SIM). If you need to install, backup or recover Sitecore instances regularly, this is a terrific time-saving tool.
As the helpful note explains, you must rename the zip file to Sitecore 8.0 rev. 141212.zip. After you do that you may need to click the "Sites & Products" button in SIM before Sitecore 8 shows up.
Sitecore 8.0 rev. 141212.zip
Along with renaming the file , I had to Unblock the Sitecore 8 zip file . To "unblock" a file, right-click it in Windows Explorer, choose Properties from the context menu, click the Unblock button in the lower right-hand corner of the resulting dialog, and hit OK or Apply.
Same with the 8.1 package. Has to be the correct name.