Not sure what went wrong for you.
You should not need to create any reg entries manually.
Perhaps try uninstalling (I recommend using 'geek uninstaller' as that should clean out the registery -
https://geekuninstaller.com/),
and then re-install the main setup using the old matrix crack as follows:
1. Copy the setup file into the same folder as the crack
2. Edit the .bat file to read: irsetup.exe __IRAOFF:543245 "__IRAFN:.\EmpireinArms-SetupRelease-DRv10503.exe"
3. Run the .bat file and install using the same serial as before (1111-1111-1111-1111)
4. When finished run the game to make sure it works prior to installing the update
5. Then install the update with the new matrix crack which has to be run as administrator
This method worked for me.