Sorry to know that you have problem using LEAD. But you don’t actually need to install the “macaque toolbox” to use the Group Connectome. The “macaque toolbox” is already deprecated and replaced by “MNI_Macaque” space if you are using the latest version of LEAD v126.96.36.199 where space switching is introduced. Though the download menu is still there in the LEAD interface.
More detailed information (for example the error log) would be helpful to solve your problem.