Installing over the Internet from Recovery Mode has always been a flacky procedure. Is there still a viable system on your MacBook? If so, you can download the version of the OS that you want to install while you are booted in that system, rather than in Recovery Mode. It will download in the Applications folder and will automatically launch. You can quit the installer and run it later if you like. Best to make a copy of the installer, or back up your system while the installer is in your Applications folder. If you followed best practices, you will have made a copy of your system before trying to reinstall it. If your hard drive has been erased, you can boot from the backup. Or use Time Machine to reinstall the system to the hard drive, if you don’t have another backup. If you don’t have a viable system available, you will have to borrow another Mac and download the installer there. Connect it to your Mac with an Ethernet or Thunderbolt cable and run the installer, being sure to select your MacBook’s internal drive. Once you’re finished this, buy an external drive and turn on Time Machine—or make a clone.
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