They are actually modified/resized from an old public domain texture collection (Golgotha) so I'll have to go through and zip everything up into pack, but it is still possible to find the Golgotha textures in their unmodified form on Google or OpenGameArt!
Viewing post in Isometric Tiles - Town Pack comments
The main problem is really that the source images are already incredibly small, so the modified versions I have are all 128x128 and there are no larger texture sizes.. Some of the original images were a bit larger, but you can use all of them however you like since the Golgotha textures are all CC0 as well!