The P2PP Tool - Download area
NB: Version 3.4.3 of P2PP fixed a bug related to the start of P100. Note that this version P2PP requires Java 1.7 or 1.8. Version 2.13.4 (for La Silla) also has some internal fixes for compatibility with Period 100 and requires Java 1.6, 1.7 or 1.8.
Please also make sure that you have Java 1.7 (or 1.8) installed on your machine. In case you do not, the links below may be useful: