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Download the full version of BCS 1.39 and then follow the installlation instructions below to update to the latest version:
Double click to install, make sure you install to the same folder as your original "Pontifex II" or "Bridge Construction Set" installation. Start Bridge Construction Set from the Bridge Construction Set shortcut in your Start->Programs->Bridge Construction Set. After running Bridge Construction Set copy the "profile" folder and the profile.cfg, pfx2.rg, hwconfig.txt and settings.txt files from where Bridge Construction Set was previously installed (probably c:\program files\bridge construction set\) to the Bridge Construction Set folder in your "My Documents" folder. Please note that you need to run the new version (18.104.22.168) of Bridge Construction Set once before there will be a "Bridge Construction Set" folder in the "My Documents" folder.
You can install the new version of BCS anywhere on your hard drive. To keep your previous bridges and settings you will need to go to your previous installation of BCS and copy the "profile" folder and the profile.cfg, pfx2.rg, hwconfig.txt and settings.txt files. To find these files "right click" or hold the CTRL key and click (for a single button mouse) on the file "bcs.app" in your old Bridge Construction Set installation. Then select the option "show package contents" from the menu that opens. You should then see the Contents folder and inside of it the Resources folder. They must be pasted into your Library\Application Support\Bridge Construction Set\ folder. You must run the new version of BCS once before the "Bridge Construction Set" folder will be created in your Library\Application Support\ folder. If you have created any custom levels you want to save you should also copy them out of the "files" folder in your old installation and into the "files" folder inside your bcs.app. Start BCS by double clicking on bcs.app.
You can install the new version of BCS anywhere on your hard drive. If you have created any custom levels you want to save you should also copy them out of the "files" folder in your old installation and into the "files" folder of your new install. Start BCS by entering the console and going to your new install location and typing "./bcs" of "./bcs_64"
After starting Bridge Construction Set, the version should show as 1.39
complete patch log
To install map packs unzip them into the following folder:
"Bridge Construction Set\files\"
"Bridge Construction Set\bcs.app\Content\Resources\files\
"$HOME\.Bridge Construction Set\Files"
The new map pack will be listed with the normal levels when you start BCS.
Chronic Logic Map Packs
Chronic Logic Files