Click Project detail and Data.
Download the file to your computer.
Open PVsyst and select Databases.
Select Known format.
Choose Solargis (Worldwide) Monthly option (orange color from drop-down menu).
Upload the Solargis csv file that you downloaded from Prospect app. Fill in the required Location information. Click Save file and Create Meteo. PVsyst will create one monthly Meteo (.MET) file for one-year period, which can be used for the simulation.