Montana doesn't support JCV, but there is no 'image only' download available so dl the smallest which is first one in the initial post, i.e. 1320_Type1693735. You will only need the image file [154 MB] but it also contains SgMyTA.JCV [241 MB] which is useless to you. Don't run 1320_Type1693735.exe, you must decompress it and in the folder named MapData you'll find the locked map image named gmapprom.
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