You can find the files for Labs 1-3 in this tutorial in the Vivado Design Suite examples directory at the following location:
<Vivado_install_area>/Vivado/<version>/examples/Vivado_Tutorial
You can also extract the provided zip file, at any time, to write the tutorial files to your local directory, or to restore the files to their starting condition.
Extract the zip file contents from the software installation into any write-accessible location.
<Vivado_install_area>/Vivado/<version>/examples/Vivado_Tutorial.zip
The extracted Vivado_Tutorial directory is referred to as <Extract_Dir> in this tutorial.
Note: You will modify the tutorial design data while working through this
tutorial. You should use a new copy of the original Vivado_Tutorial
directory each time you start this tutorial