With the release of kde sc 4.4 nepomuk will depend on virtuoso for data storage. officially only 6.1.0 and higher will be supported.

since, however, many people already tested nepomuk in kde sc 4.4 with virtuoso 5.0.12 and the database format changed significantly we provide this conversation tool.

simply start it after installing virtuoso 6.1.0 and let it do the conversion automatically.