I have just rebuilt the Linux builds of 4.3.36 and re-loaded them onto the website. Alas the previous build was linked to python 2.7 by mistake, and this causes several problems as people have discovered recently.
Please go and re-download 4.3.36 for Linux if you are seeing messages like 'ImportError: No module named _weakref' or 'ImportError: No module named site'.
This does not affect the Mac or Windows platforms though.