Path missing or damaged?

Install El Capitan or Later from Scratch

If possible backup your files.

1. Restart the computer. Immediately after the chime hold down the CommandandRkeys until the Apple logo appears. When the Utility Menu appears:
2. Select Disk Utility from the Utility Menu and click on Continue button.
3. When Disk Utility loads select the volume (indented entry, usually Macintosh HD) from the Device list.
4. Click on the Erase icon in Disk Utility's main window. A panel will drop down.
5. Set the Format type to APFS (SSDs only) or Mac OS Extended (Journaled.)
6. Click on the Apply button, then wait for the Done button to activate and click on it.
7. Quit Disk Utility and return to the Utility Menu.
8. Select Install OS X and click on the Continue button.

This will install the version of OS X you had installed.

Skindeepc

Try starting in safe mode. If that works no need to redo system yet:

Shut down system

Press start button

Hold shift key when you hear the chime or see the grey screen.

Safe mode takes extra time to load so be patient.

If it starts up you can try disk utility. Then try a regular start up.

Pete

Search for "path /System/Installation/Packages/OSinstall.mpkg appears to be missing or damaged" on Google. I found quite a few links dealing with this problem. The cure is not simple, apparently.

Are you trying the above while booted from the Recovery HD? Are you trying to erase just the macOS volume and not the entire drive?

What are you trying to do? Please read Please read Writing an effective Apple Support Communities question.

Seems like the best solution is to reinstall macOS. You should be able to do that from Recovery mode.

How to reinstall macOS - Apple Support