Try to install the Email app directly from Google Play Store. If this app is shown as incompatible on your device, side-load it by downloading it from here, enabling the Unknown sources in Settings -> Security, and installing the apk.

Keep in mind though that this version sometimes breaks the Exchange functionality on some (mostly non-Nexus) devices. In order to resolve this, you need to also install a copy of latest Exchange2Google.apk app that is available for download from here or here.

Try to install the Email app directly from Google Play Store. If this app is shown as incompatible on your device, side-load it by downloading it from here, enabling the Unknown sources in Settings -> Security, and installing the apk (either by tapping the apk in the download manager, or via ADB from your PC: adb install -r <path-to-apk>).

Keep in mind though that this version sometimes breaks the Exchange functionality on some mostly non-Nexus devices. In order to resolve this, you need to also install a copy of latest Exchange2Google.apk app that is available for download from here or here. You don't have to install it as a system app, just side-load it in the same manner as described above.