This is the artifact for the POPL 2024 paper "Fully Composable and Adequate Verified Compilation with Direct Refinements between Open Modules". The artifact is a VM image in .ova format. We have tested the VM in VirtualBox version 7.0.8 running on a host Windows 11 machine with 64-bit Ubuntu LTS 20.04. The source code can be found in the directory '/home/authors/direct-refinement-popl24-artifact'. Follow the 'README.md' file in this directory to evaluate the artifact. The VM should also work on Linux host machines. Note that the VM will not run on Mac computers with M-series chips as it is based on X86. You may also compile from the source code on your local Linux machine. The up-to-date source code and instructions for compiling it can be found at the following address: https://github.com/SJTU-PLV/direct-refinement-popl24-artifact/blob/main/README.md We suggest you look at the instructions in the above URL if you have difficulty reading README.md file directly in the VM. The technical report of our paper can be found at the following address: https://arxiv.org/abs/2302.12990