Never, ever, install a Google Account Manager APK that asks for "Accessibility permissions" or "Draw over other apps." The legitimate version requires zero user-facing permissions. If it asks for those, it is a banking trojan.
Before you hunt for this file, consider better alternatives: download google account manager 7.1.1
MicroG is a FLOSS (Free/Libre Open Source Software) replacement for Google Play Services. It requires a patched version of Google Account Manager 7.1.1 to function. If you are de-googling but still need push notifications, this is the version you need. Never, ever, install a Google Account Manager APK
Newer versions of Account Manager (8.x and 9.x) are tied to specific Android security patches. For unofficial ROMs, dropping a modern Account Manager onto an older framework causes constant crashes. Version 7.1.1 has become the "gold standard" for compatibility on legacy hardware and MicroG alternatives. It requires a patched version of Google Account Manager 7
Before downloading, you must allow your device to install apps from sources other than the Play Store.