About license, I just needed to create a Microsoft account and it's ok (Community version doesn't need more). About language, I installed English pack and changed the UI in options/env (see https://docs.microsoft.com/en-us/visualstudio/install/microsoft-language-interface-packs-lips-and-visual-studio?view=vs-2015) But https://docs.microsoft.com/en-us/visualstudio/ide/reference/international-settings-environment-options-dialog-box?view=vs-2015 indicates: " Caution: In a system with multiple languages installed, the Visual C++ build tools (cl.exe, link.exe, nmake.exe, bscmake.exe and related files) are not affected by this setting. These tools use the version for last language installed and the tools for the previously installed language are overwritten because the Visual C++ build tools do not use the satellite DLL model. " So don't know if it'll help but indeed English is last package installed and selected. I'm rebuilding nss from scratch right now and had regexp sed pb again, so patched it locally and now i'm still seeing "expr: syntax error". I'm waiting for the result. (Should I had to reboot so English language is taken into account?) -- Sent from: http://document-foundation-mail-archive.969070.n3.nabble.com/Dev-f1639786.html