xbox x won't install games, corrupt save files , gone repair, back the same

It sounds like you may have a corrupted save file or a corrupted download. You may want to uninstall the games, then clear local saved games (don't worry you won't lose anything it's all saved to the cloud) Then try the install again.

What external things would corrupt it then

How do I fix a "saved game corrupted" error?

You may get an error message that resembles the following when you try to play a saved game on your Xbox console: Saved game corrupted To resolve this issue, try the following solutions: Solution 1: Delete the corrupted game
file OR If you tried to delete the corrupted game file, and it doesn't work, your console may need to be repaired. Start the repair process. Note You cannot recover a corrupted saved game file. To protect other content, you must delete the corrupted file.
Determine if the saved game is corrupted. To do this, follow these steps: Select settings, System, and then Storage. Select the storage location, and then press the A button. Select Games and Apps, and then press the A button. Select the game, and then press
the A button. Select the saved game, and then press the A button. Note A corrupted saved game file is marked with a yellow exclamation point. If the saved game file is corrupted, delete the corrupted file. To do this, select Delete.
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I had the same problem; it's not a disc problem but a corrupted save file. It made it so that my xbox wouldn't load any of the save files from my hd, even the ones that aren't corrupt.

So i just went into system management and copied one of the older save files to another location and loaded from there. (I probably could have also gone into system management and deleted the corrupted save and tried loading from the HD.)

You may want to uninstall the entire game, Then clear the cache or local saved games before installing again. (Don't worry you won't lose any saved progress) It could just be a corrupted file.

To resolve this issue, try the following solutions:

Solution 1: Delete the corrupted game file

If the saved game file is corrupted, delete it. Here's how.

Note You cannot recover a corrupted saved game file. To protect other content, you must delete the corrupted file.

1. Determine if the saved game is corrupted. To do this, follow these steps:
   1. Select settings, System, and then Storage.
      
   2. Select the storage location, and then press the A button.
   3. Select Games and Apps, and then press the A button.
      
   4. Select the game, and then press the A button.
   5. Select the saved game, and then press the A button.
      Note A corrupted saved game file is marked with a yellow exclamation point.
      
2. If the saved game file is corrupted, delete the corrupted file. To do this, select
   Delete.

Solution 2: Request a repair

If the issue is not resolved, your console may need to be repaired.
Start the repair process.