LineageOSrom.net - Download Xposed Framework Installer for Android Nougat Custom ROM Lineage OS 14.1 current status are not supported yet. It still in questions on many android development forum.
The status for Xposed Framework and its module still in dvelopment. Nothing much to say. Rovo was said it clearly:
That's all we know. And if you want to install Xposed Framework on your Nougat Custom ROM, you should wait until it available and works. And this also affect (offcourse) all build of Lineage OS 14.1. Bear the beer guys..