Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce GTX 980/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 436.30
Broken: version: 2.81 (sub 12), branch: master (modified), commit date: 2019-09-27 17:16, hash: rBbe985bdde27f
Short description of error
I tried using the baseline settings for the QuadriFlow Remesher on a model with around 728k verts with a ratio of 1.000. The process however was incredibly slow and did not reach 50% until several minutes of waiting. Once that happened, QuadriFlow refused to complete the action and cancelling the action did nothing. The process also ate an incredible amount of RAM, practically maxing out mine which has 32 GB built in.
Exact steps for others to reproduce the error
You can try using QuadriFlow on the sculpt file shown in the video here.