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If by installed a map, you mean be able to play it via the SC2Allin1 tool, just use the tool to add the maps for you. Otherwise, if you wish to play it via bnet itself, you will have to first publish onto battlenet first before playing. The cache simply stores whatever maps you have downloaded so that you dont have to re-download them whenever you wish to play them again.
If by installed a map, you mean be able to play it via the SC2Allin1 tool, just use the tool to add the maps for you. Otherwise, if you wish to play it via bnet itself, you will have to first publish onto battlenet first before playing. The cache simply stores whatever maps you have downloaded so that you dont have to re-download them whenever you wish to play them again.