Hello Xavier,

I've just finished installing PACKMOL in Windows 10 (64 bits) here is the process I followed, hope it works for you.

- Install Cygwin, according to their description "Linux-like environment for Windows" (https://cygwin.com/install.html)

- When you are installing Cygwin, you will have the possibility to select which packages. Install gcc and make.

- After that you can follow the instructions provided in the user guide (http://www.ime.unicamp.br/~martinez/packmol/userguide.shtml)

I already executed some of the examples and everything worked just fine.

Thank you very much