If your goal is simply to run legacy code or open old project files, installing the full Ultimate suite may not be necessary. Microsoft released the (Integrated and Isolated modes). This is a lightweight version of the IDE that allows for basic code editing and is often easier to install on modern operating systems without the overhead of the full enterprise toolset.
Visual Studio 2010 Ultimate can be downloaded from Microsoft's official website or purchased from authorized resellers. The installation process is straightforward, but it does require careful planning, as the product requires: microsoft visual studio 2010 ultimate download extra quality
If you need this specific version for maintaining legacy projects, you have a few official paths: Visual Studio Subscription (formerly MSDN): If your goal is simply to run legacy