You can find the full PDF via the TU Wien Research Portal . Why do you have this version?
Furthermore, if you do delete it, Windows or your graphics card software will simply reinstall it the next time your drivers update. It takes up less than 20 MB of space, meaning there is no practical benefit to removing it. How to Safe Download and Reinstall Vulkan 1.0.65.1 vulkan run time libraries 1.0 65.1 download
It is common to have multiple versions. Different applications or games, especially older ones, may have been packaged with a specific version of VulkanRT that they required to run correctly at the time of their development. As you install different software and update your graphics drivers, it can leave behind older, unused versions. As mentioned, it's often best to leave them, as they take up little space and ensure backward compatibility. You can find the full PDF via the TU Wien Research Portal