Open the file TestExcel.xlsx and try to re-evaluate one of the cells the CoolProp formulas should all be working now.Make sure the CoolProp Add-in is selected (box checked) and close the Add-in Manager.Browse to the file CoolProp.xlam you downloaded and select it.Click the Browse button on the Add-in Manager panel.At the bottom, select Manage: Excel Add-ins, then click the Go.The TestExcel.xlsx from MicrosoftExcel can be copied to a working directory in My Documents.and copy the files to a convenient accessible location. Download the xla and xlam files from MicrosoftExcel and activate the add-in from Excel as described below.The Excel macro will select the correct one and use it. Technically you only need the DLL that matches your system architecture ( CoolProp_stdcall.dll = 32-bit, CoolProp_圆4.dll = 64-bit), but it can’t hurt to copy both if you don’t know which system architecture version you have. Make sure to add that folder to your path. Get the shared libraries at shared_library/Windows/32bit_stdcall and shared_library/Windows/64bit, put the DLLs into a folder of your choice and rename them to CoolProp_stdcall.dll and CoolProp_圆4.dll.
