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1. Put the file "DOOM2.WAD" on the DOOM4 folder.
2. Open the DOOM4 folder on DOS
3. Type "DOOM4.bat"

4. Have fun! :-)

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If you want, you can also use command-lines that should go like that:

doom2 -file [CUSTOMWAD].wad D4V.wad

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Be aware that you NEED this executable to play the mod, since it's already merged with the Dehacked file. If you try to play with other executable, you will have to merge the .deh by yourself - which can only be made using the original Dehacked for DOS.