This article describes a possible fix for the issue that some players have encountered related to ‘SimConnect.dll’
With the help from some users, OnAir has found a possible solution to ‘SimConnect.dll’ missing from certain PCs.
The following fix might solve the issue on most computers:
Install the X64 Microsoft Visual C++ Redistributable for Visual Studio 2015, 2017 and 2019 form the Microsoft site : https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads
Direct download x64: vc_redist.x64.exe
If the above suggestion doesn’t work on your PC and you have SimToolkitPro installed, please try uninstalling SimToolkitPro.
If after these steps the issue persists, please submit a new ticket.