Can't generate TB for Cyclone10GX_PCIeGen2x4_DMA_18_0_project

I downloaded

AN 829: PCI Express Avalon -MM DMA Reference Design for ​Quartus Prime 18.0.0 Pro from

https://fpgacloud.intel.com/devstore/platform/?acds_version=18.0&family=cyclone-10-gx.

This is the only design in Project with nothing else added.