We do not currently provide support for moving SQL Compact databases to SQL Server or vice versa. Such a move would require custom programming, as these two database servers are completely different from one another. For Lansweeper 5.1, we will most likely develop a migration tool. Lansweeper 5.1 won’t be released for at least another few months however.
You can reinstall under SQL Server by running the Lansweeper installer and choosing New Installation\Advanced Install.