OTL depends on Microsoft Visual Studio Tools for Office Runtime (VSTO, for short) to run. VSTO, in turn, depends on Microsoft Visual C++ 2010 Redistributable.
- Microsoft has not published any End of Life (EoL) notification for VSTO;
- However, it has published an EoL notification for Microsoft Visual C++ 2010 (MSVC++ 2010); please see https://learn.microsoft.com/en-us/cpp/windows/latest-supported-vc-redist?view=msvc-170#visual-studio-2010-vc-100-sp1-no-longer-supported).
Some of our customers have raised concerns regarding this version of MSVC++ Redistributable no longer being supported.
Even though MSVC++ 2010 was declared EoL, Microsoft continues to support it when installed by a Microsoft product that is still in support. Therefore, you should have no issues with MSVC++ when installed by a supported version of VSTO.
Find out more about support for Microsoft Visual C++ here: https://learn.microsoft.com/en-us/visualstudio/productinfo/vs-servicing#microsoft-visual-c-redistributable.