So many 64s
80 points Hard

Help! My friend stole my flashdrive that had the flag on it. When he gave it back the flag was changed! Can you help me decrypt it? https://mega.nz/#!OHhUyIqA!H9WxSdG1O7eVcCm0dffggNB0-dBemSpBAXiZ0OXJnLk

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Rating 3.91
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