> Overwrote the source files.
No, this is wrong. Don't overwrite. Move the old Moodle folder out of the way, put the new one in its place, and then copy the config from the old folder to the new. Once you have updated core, then update 3rd-party (=non-core) plugins as needed, e.g. HotPot. See these docs:
- Moodle docs: Upgrading
Move your old Moodle software program files to another location.
Do NOT copy new files over the old files.
Your upgrade path should be: 1.9 (-> 2.0) -> 2.2 -> 2.4
Probably you have your own reasons for stopping at 2.4, but I recommend going at least for 2.6 because it is more recent, so it will be supported for longer. Of course, the most recent stable version is 2.7, and I understand that 2.7 will be supported for a very long time.
I suggest you go back to your Moodle 1.9 backup of the database and files, and upgrade again following the intructions in the Moodle docs.
Your frustration is understandable, but the sarcasm evident in your previous message is not endearing.