Redistributable Packages

IMPORTANT Installation Notes  for WINDOW and THERM -- PLEASE READ and install the 2 libraries linked below 

Redistributable Packages/Libraries that MUST BE installed before this version will run
(if you have not previously installed them)

It is necessary to download and then install the following "redistributable" software packages in order for this version of WINDOW to run.

If you do not install these you will get error messages about DLLs not being found.
 

Microsoft Visual C++

• Click on the link below to access the Microsoft Visual C++ Redistributable libraries web page.

https://learn.microsoft.com/en-us/cpp/windows/latest-supported-vc-redist?view=msvc-170
In the section called "Visual Studio 2015, 2017, 2019, and 2922, under the "Architecture" == "X 86" section, click the link to download the file called "vc_redist.x86.exe" and then run it (double click on it) once it is downloaded

Intel Fortran

Updated September 9, 2025

• Click on the link below to access this web page "Microsoft Windows* and macOS* Runtime Versions
• https://www.intel.com/content/www/us/en/developer/articles/tool/compilers-redistributable-libraries-by-version.html
• On that page, there is table with different compiler versions. In the section ( the second one on the page) called "Intel® Fortran Compiler Runtime for Windows* (IFX/IFORT)", select the link called:
  • 2023.1.0 / 2021.9.0 

• That will cause an EXE file to be downloaded (theoretically that filename could change over time)
  • w_ifort_runtime_p_2023.1.0.46319.exe
• Run that EXE and the installer will ask where to install it, the default being a subfolder of your downloads folder
• Then the installation of the library will begin, and you should see a progress screen as it is installed.
• When the installation is complete, click the Finish button to complete the installation. 

Troubleshooting

If you get an error message when starting THERM or WINDOW saying that specific DLLs are missing, do the following

• Check this folder to see if it exists and has DLL files in it
  • C:\Program Files (x86)\Common Files\Intel\Shared Libraries\redist\ia32_win\compiler
• If it does have files, copy those files into the THERM or WINDOW directory where the program executables are located, such as below, for THERM 7.8
  • C:\Program Files (x86)\LBNL\THERM7.8
• Retry starting the software (THERM or WINDOW)

If you have any other problems or questions about the installation, email THERMHelp@lbl.gov or [email protected].