I was trying to manually import data from 1961. While I could get this to work with the sample files, I could not with my own data, even though the input file was practically identical. After much difficulty, a pop-up came up and stated that PVsyst is only compatible with years 1980-2060. I found this to be very frustrating for two reasons: 1. This was not stated anywhere in the tutorial or help file. 2. As the data is manually, why should the year range matter? As long as there are a sufficient number of file entries, this should not be an issue. Thank you.