Since the "ALLiANCE" release is a standard BluRay rip, most English subtitles designed for BluRay or YIFY releases will be "in sync" (meaning the text matches the audio timing) for your version.
You can find and download the appropriate subtitle files from these popular community databases: subtitle The.Duff.2015.720p.BluRay.x264-ALLiANCE
: A comprehensive source where users often upload files specifically labeled for the "ALLiANCE" or "x264-BluRay" releases. Since the "ALLiANCE" release is a standard BluRay
: Provides various English subtitles for The DUFF (2015) that are compatible with BluRay rips. Quick Sync Tip: Quick Sync Tip: If the subtitle you download
If the subtitle you download is slightly off (e.g., the text appears a second before the actor speaks), most media players like allow you to adjust the timing manually: Press G to delay the subtitle. Press H to speed up the subtitle. The DUFF 2015 BluRay.YIFY english subtitles - MSubs.net
: One of the largest repositories. You can search directly for the full filename to find the most accurate match.