Installer discrepancy on the updated file...
original install path: ...\My Documents\SimCity 4\Plugins\BSC\BRT\Bridges
updated install path: ...\My Documents\SimCity 4\Plugins\BSC\BRT\AvenueBridges
Failure to manually cut and paste to overwrite original will result in duplicates of BRT_SGCanal_AveBridgeIron01_1132edbb.SC4Lot in your plugins...
The install path is the correct one from the pack of bridges on the LEX so your "original" install path must refer to the single sets that were on the STEX.