Dear Marc,
the new version is released:
https://forum.sweep-me.net/t/sweepme-1-5-7-8-released/219/1
If you start SweepMe!, you will see a message in the General tab that informs you about the possibility to update to 1.5.7.8
Alternatively, you can download a full installer from our website.
Luckily, we planned with a new update this week so that your bug just came right in time. 
Thanks and let us know if anything does not work.
Best, Axel