Activation of maps with equivalent metas. If you have a map that has no meta, you may be able to activate it if there is an equivalent meta.
So, in simple terms (Northern_US_and_Canada_975_7750 example):
Download/decompress/copy the map that you want to activate (but for which you don't have the meta).
Delete the relavent .meta file
Copy into the map folder the .meta file from the other map (same country - compatible as number) for the same country
Activate the map with the usual system.
Copy map Northern_US_and_Canada_975_7750
Delete map 975_7750 meta file (Northern_US_and_Canada-100878.meta)
Copy the meta of 975_7749 (Northern_US_and_Canada-100877.meta) that has meta code into map 975_7750 folder
Unlock the map.