SpecRun.SpecFlow 1.2.0 is not compatible with UAP,Version=v10.0

We have written a Universal Windows application and want to use SpecFlow for testing. We created a Universal Windows test project. Trying to install the SpecRun.SpecFlow NuGet package fails with this error:

    ...
Installing SpecRun.Runner 1.2.0.
Installing SpecFlow 1.9.0.
Installing SpecRun.SpecFlow 1.2.0.
SpecRun.SpecFlow 1.2.0 is not compatible with UAP,Version=v10.0.
SpecFlow 1.9.0 is not compatible with UAP,Version=v10.0.
Some packages are not compatible with UAP,Version=v10.0.
SpecRun.SpecFlow 1.2.0 is not compatible with UAP,Version=v10.0 (win10-arm).
SpecFlow 1.9.0 is not compatible with UAP,Version=v10.0 (win10-arm).
Some packages are not compatible with UAP,Version=v10.0 (win10-arm).
SpecRun.SpecFlow 1.2.0 is not compatible with UAP,Version=v10.0 (win10-arm-aot).
SpecFlow 1.9.0 is not compatible with UAP,Version=v10.0 (win10-arm-aot).
Some packages are not compatible with UAP,Version=v10.0 (win10-arm-aot).
    etc.

How to solve this? Are specific project settings required? Or can someone certainly confirm SpecFlow is indeed incompatible? The SpecFlow documentation is fairly unspecific about supported platforms.

Installed package: