Hi Gustaaf and welcome to the user to user forums.
The best way to find out is to try and apply. See what the offer actually is when filling out the required information. You should get an upgrade price offer to see the amount to pay before you are committed to a purchase.
Be aware it will replace your current software and that at present not all the bugs are ironed out of this particular program yet. See the sticky Topics at the top of the forum main pages to se what the current state of the program is.
As Ray says, try out VPX13 to see what it does. Right now, it is very buggy and not usable except for finding more bugs. A patch is desperately needed.
As for MEP, do you have 2021? If so, is it still covered by the Update Service (1 year from when you last paid)?
I much prefer to use VPX than MEP due to more features. Take a look at the comparison chart to see some of the differences.
I would have thought an upgrade offer would be a replacement rather than an additional program but if it is possible to keep the old program that is not something I would have expected.