Load Alessandro Vespignani's ISI publication history using 'File > Load' and following this path: 'yoursci2directory/sampledata/scientometrics/isi/AlessandroVespignani.isi' (if the file is not in the sample data directory it can be downloaded from 2.5 Sample Datasets).
New ISI File Format
Web of Science made a change to their output format in September, 2011. Older versions of Sci2 tool (older than v0.5.2 alpha) may refuse to load these new files, with an error like "Invalid ISI format file selected."
If you are using an older version of the Sci2 tool, you can download the WOS-plugins.zip file and unzip the JAR files into your sci2/plugins/ directory. Restart Sci2 to activate the fixes. You can now load the downloaded ISI files into the Sci2 without any additional step. If you are using the old Sci2 tool you will need to follow the guidelines below before you can load the new WOS format file into the tool.
You can fix this problem for individual files by opening them in Notepad (or your favorite text editor). The file will start with the words:
Just add the word ISI.
And then Save the file.
The ISI file should now load properly. More information on the ISI file format is available here (http://wiki.cns.iu.edu/display/CISHELL/ISI+%28*.isi%29).