At roughly 70MB to 90MB , it is ideal for devices with small system partitions.
Without rebooting, select Install in recovery and choose the BiTGApps-arm-12.0.0-R45_signed.zip file. Reboot: Wipe cache/dalvik and reboot to the system. bitgappsarm1200r45 link
For older specific revisions like R45, the 4PDA BiTGApps Thread often maintains an archive of various builds including R45. Key Features of the R45 Build At roughly 70MB to 90MB , it is
Automatically applies battery optimization for all Google apps and services. For older specific revisions like R45, the 4PDA
Can be installed as a Magisk module if you prefer a non-destructive installation. How to Install BiTGApps R45
Ensure your device is ARM (32-bit) and not ARM64. You can use an app like "Droid Info" from the Play Store to verify this.
If you are already on a newer build like R46 or later, it is generally recommended to use the latest version rather than hunting for a specific older revision unless a particular ROM requires it for compatibility. BiTGApps | Google Apps Package