kuid:68787:100904 is track used by LP bridge and xcrossings, these will show as having a missing dependency in CMP. Just open these up in explorer and open the config.txt file. Swap the kuid:68787:100904 for the track or bridgetrack asset used in the obsoleted version of the LP assets, and don't forget to do the same in the kuid table at the bottom of config.txt.
kuid:68787:100904, same procedure for the LP Road Bridge 4-lane (from memory!).
Close commit and all affected assets will be sorted, with luck.