If you'd like to move forward with the installation, let me know: What is your specific (e.g., P3110, P5110)? Are you currently on the stock Samsung software ? Do you have a Windows PC available for the Odin process?
The .tar.md5 extension ensures that the file is not corrupted during download, preventing a "brick" during the flashing process. espresso-common-twrp-3.3.0-2.tar.md5 download
Move away from the sluggish Android 4.x and try SlimLP, LineageOS, or OmniROM. If you'd like to move forward with the