I reinstalled the extension.
On machine #2 it is activated now and looks like working.
But on machine #1 It has "the serial number you entered is incorrect" message when I hit activate button, which was machine#2 problem.
I checked the difference between machine#1 and machine#2,
and found out that when installed on machine#2, which is now working, has only one language folder that is "ja_jp" in DW 2014.1 folder,
but machine#1, which has error activating, has two language folders, "ja_jp" and "en_us", and each folders has the "confuguration" folder.
Any resolution I can do?