My first passive crossover design!

Joined 2008
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Since a crossover is relative, when you make measurements for both sides with the same mic you can still blend them properly. Response discrepancies respond to simple global EQ. This voicing is typically done by ear after a cross, and needn't necessarily end up in a flat response in any case.
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Seeing Boxsim mentioned. Visaton drivers are no problem as all the info needed is in the data files it comes with
Other brands ideally need the plots usually provided on their data sheet. These can be traced to text files via an app and entered. Or this can be omitted but the data should provide a more accurate model.
The data for other brands can't be saved. However a project file can be. It makes sense to save one once the basic data is entered. This can be reloaded for restarts if needed. Various versions can be saved the same way.

You'll need to spec several things about the box including speaker positions. Tedious so saving early on can be handy. It defaults to common box so ignore the "facia" one which will be blocked out in it's default settings anyway.

If you get an error message click on it - it will report what the problem is. At least a clue.

The extra section offers a number of things including cross over design. You can read impedances off the plots and use these to get things started, It can also calculated speaker impedance correction circuits. ;) They work but for me resulted in the need for some rather high capacitor values. 2mF, not a problem years ago but seems to be now. This did make the cross over responses more ideal though.

The optimiser is interesting. Maybe run it on all parts initially but parts or circuits can be selected individually. It will find a decent solution for the speakers you have chosen but that may result in cross over frequencies not where you want them. It may not be the only solution. It's possible to try and steer it by just optimising some of the speaker circuits.

I found this site useful
For instance I wasn't happy about part of the hf response. One design had added some bits to the cross over. I copied them into my design to see what they did. That and optimisation solved my problem. It also encourage me to try reversing the polarity of one of the speakers, All in all a good education tool.

Mic's any mic is better than none and the Behringer one is likely to a good cheap option. Their USB interfaces may be too.