I thought you might be interested in looking at [Resolved] 1.55 Patch error for Arma2 & BAF - cannot find xdelta3.exe, phase 5..
https://forums.bohemia.net/forums/topic/105728-resolved-155-patch-error-for-arma2-baf-cannot-find-xdelta3exe-phase-5/?do=findComment&comment=1762435
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