When using LoadBuilder in the 64-bit version of WaterGEMS or WaterCAD, the program crashes. The 32-bit version of the program works without issue.
Try to reinstall the Visual C++ Redistributable package. From the "Programs and Features" dialog in Windows, search for "C++". Note that versions installed (the year and the x86 vs x64 designation). I recommend taking a screenshot. Then, uninstall each one. Next, reinstall WaterGEMS or WaterCAD by running the setup executable. This should search for the prerequisites and reinstall the C++ runtime redistributable components. After WaterGEMS has completed reinstalling, search for "C++" again under Programs and Features, note the versions installed. If some versions are missing compared to the initial list, you can search for and download/install them from Microsoft's website (in case other applications on your computer rely on them).