To install Mapdekode (MDK) first time you need three files:
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1.) Mapdekode_Setup_5.4.zip
2.) Mapdekode_Extras_5.4.zip

Extract the files from 1.) in a new folder and start SETUP.exe
After the setup, extract the files from 2.) in the Mapdekode.exe program folder.

Updates to newer MDK versions:
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you need only the file e.g. Mapdekode_5.4.70.zip with a new EXE and sometimes 
with new msgtext_xx.dat files.
