Users may have issues viewing the Live Parts Add-in toolbar in SOLIDWORKS following initial installation of the software. If this occurs, please ensure you are viewing SOLIDWORKS at the assembly-level. The Add-in Toolbar is only functional at the assembly level (i.e. users can only define Live Parts features at the assembly level and NOT at the part level), so it will not be visible if you are editing a part.
If you are still having issues, please try opening one of the sample assemblies (for example, the "swingarm" file) located at C:/Program Files/LivePartsSolidworks/assemblies and view in assembly mode.
If you continue to have issues, you can submit a support ticket from here in the help center or by emailing firstname.lastname@example.org.