It’s a shame. I have discovered the program but it doesn’t work for me. I was doing a 600 km route but with an intermediate section of 15 km of off-road track… Kurviger doesn’t let you link the two sections with points and doesn’t let you do the route because of that detail… a shame it’s not perfect
I guess no software will be ever perfect 
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You can link off-road tracks using the Beeline mode (bird icon):
Please note, you need to have a Tourer subscription for this: https://kurviger.de/premium/en
Premium?..
Ohhhhh