Well, there is a lesson here.
Product awareness is very important. To be honest, the documentation is pretty clear, and I'm a bit confused as to how such a mistake could be made.
But at this point, your best bet is to focus on undoing the damage.
X3 Producer should be at X3
e. Depending on where you were, you may have overwritten the current version with an older one. Did you get any warning messages while X3a was installing?
Do you have System Restore enabled on your computer? If so, restore to before you installed X3a.
Then, open X3, and click Help>About Sonar. This will show you which version you have installed.
If it shows anything less that X3e, go to support and download the e update patch.
As Grem noted update patches are free.
The upgrade is for people upgrading from earlier versions(ie Sonar 8, etc).
You might want to call customer support Monday. They may be able to issue you a credit. No promises, but it's worth a shot.