SaiSan I can vouch for 3.17 on any OS type as we run this version on all of our nightly run nodes. However, I recommend using the latest version available that you can get to compile on your machine and work with ISSM. Note that we are currently updating the PETSc version used on our nightly runs. I will update the website documentation with the above note and the latest version that we run once I have done so.