In any case, if there is an update to the tileset, and you want the new tileset instead of this one, but need to resize it, it's pretty easy to fix:
First you have to go to the tileset's folder, and find "tile_config".
Just at the start of the file you will see this:
You have to change the value of "height" and "width" to the size you like to use for each tile. Have in mind that you should generally use double the size or something like that, to avoid losing quality. Also pick a number that is easy to use. Because i doubled the height and width of the tileset, i used in "height" and "width" 48 instead of 24. Remember, do not change anything else, ONLY the numbers. Not even that comma. Only the numbers, or it will fail to read the tileset.
After having saved the file, you have "tiles.png" and "fallback.png". You have to open those in photoshop or the program you have (but i really suggest photoshop because is the only one i know were you can resize without losing quality) and then you resize it.
Because i doubled the height and width of the tileset, i will double the size the size of the two images.
In photoshop, you have to go to Image... then to Image Size, and then you will see a window like this:
Put those exact values if you want it double. If you want it to not lose image quality, at the dropdown menu in the down part, use "Nearest Neighbour".
Then you save all files, and play! It's really easy, just three minutes! (: