Kroll Posted October 1, 2012 Posted October 1, 2012 (edited) I cleaned DCS world off my drive. Reinstalled 1.2.1... As I went into multi player it started to pop me for more activations. It appeared to stall on the P-51 activation and I never saw it ask for the A-10. Anyway it lets me in to the multi player menu. When I put my login and password in it comes back with Invalid serial number. Answer is here: http://forums.eagle.ru/showthread.php?t=91898&highlight=invalid+serial+number Edited October 1, 2012 by Kroll
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