Dear phenix developers, I get errors trying to install latest builds from 1.14.3405, 3406, 3409 64bit centos6 on Scientific Linux machines still running 6.6 (kernel 2.6.32). 1.14.3395 installed without any problem. The downloaded file is OK. 1.14.3409 64bit centos6 installed on Ubuntu 18.04 without any problem. I also tried to install from source but got the same error output (see below). I googeled some error outputs - looks like some python error. Do I have to update finally? Best regards, Guenter Output trying to install from source: [guenter@msm68 phenix-installer-dev-3409-source]$ ./install --prefix=/home/software/PHENIX/1.14.3409/ --nproc=10 Traceback (most recent call last): File "./bin/install.py", line 20, in <module> from libtbx.auto_build import install_distribution File "/home/software/PHENIX/1.14.3409/phenix-installer-dev-3409-source/lib/libtbx/auto_build/install_distribution.py", line 75, in <module> from libtbx.auto_build import install_base_packages File "/home/software/PHENIX/1.14.3409/phenix-installer-dev-3409-source/lib/libtbx/auto_build/install_base_packages.py", line 28, in <module> from .package_defs import * File "/home/software/PHENIX/1.14.3409/phenix-installer-dev-3409-source/lib/libtbx/auto_build/package_defs.py", line 18, in <module> from .bootstrap import Toolbox File "/home/software/PHENIX/1.14.3409/phenix-installer-dev-3409-source/lib/libtbx/auto_build/bootstrap.py", line 14, in <module> import argparse ImportError: No module named argparse Similar from an installer: [guenter@msm68 phenix-installer-dev-3405-intel-linux-2.6-x86_64-centos6]$ ./install --prefix=/home/software/PHENIX/1.14.3405/ Traceback (most recent call last): File "./bin/install.py", line 20, in <module> from libtbx.auto_build import install_distribution File "/home/software/PHENIX/1.14.3405/phenix-installer-dev-3405-intel-linux-2.6-x86_64-centos6/lib/libtbx/auto_build/install_distribution.py", line 75, in <module> from libtbx.auto_build import install_base_packages File "/home/software/PHENIX/1.14.3405/phenix-installer-dev-3405-intel-linux-2.6-x86_64-centos6/lib/libtbx/auto_build/install_base_packages.py", line 28, in <module> from .package_defs import * File "/home/software/PHENIX/1.14.3405/phenix-installer-dev-3405-intel-linux-2.6-x86_64-centos6/lib/libtbx/auto_build/package_defs.py", line 18, in <module> from .bootstrap import Toolbox File "/home/software/PHENIX/1.14.3405/phenix-installer-dev-3405-intel-linux-2.6-x86_64-centos6/lib/libtbx/auto_build/bootstrap.py", line 14, in <module> import argparse ImportError: No module named argparse