If you still see an older map than the version listed at the top of the page then open the image by right clicking the link & selecting “Open image in new tab”.
Then, while in that tab, force your browser to refresh its cache by pressing CTRL+F5.
With the PSD you can edit the overlay to your liking. Some people make translations or callout-maps to use with their friends for example. I try to keep the PSDs somewhat organized so it should be easy to edit. Just read -> this disclaimer first.