Dopo ricerche, sono giunto a questa lista di files, può andare bene (scusa per i continui post e domande magari inutili però voglio fare tutto per bene, se risulto pressante, ripetitivo o fastidioso, non esitare a dirmelo)
ROM: https://theunlockr.com/rom/lineageos-15-0-rom-31/
TWRP: https://downloads.akhilnarang.me/TWRP/oneplus3/
GAPPS: https://opengapps.org/
WEBVIEW_PATCHES: https://github.com/opengapps/opengapps/wiki/Notes-for-Android-7.x
MAGISK MANAGER: https://github.com/topjohnwu/MagiskManager/releases/download/v5.1.1/MagiskManager-v5.1.1.apk
MAGISK INSTALLER: tiny.cc/latestmagisk
ROM: https://theunlockr.com/rom/lineageos-15-0-rom-31/
TWRP: https://downloads.akhilnarang.me/TWRP/oneplus3/
GAPPS: https://opengapps.org/
WEBVIEW_PATCHES: https://github.com/opengapps/opengapps/wiki/Notes-for-Android-7.x
MAGISK MANAGER: https://github.com/topjohnwu/MagiskManager/releases/download/v5.1.1/MagiskManager-v5.1.1.apk
MAGISK INSTALLER: tiny.cc/latestmagisk