Windows Classic Theme on Windows 10?

Yes, it is. And it is surprisingly simple.

Step 1: Download The Pack

For user convinience, all the files you’ll need are compiled into this pack.

Step 2: Extract The Archive

In order to use the items in the pack permanently, you will need to extract the items from the archive. However, you will not be able to do this with vanilla Windows, you will need a program like 7-Zip or WinRAR to extract them. You can put them anywhere of your choice.