We have a piece of very old code which is not able to compile in latest version of Visual Studio and as my team suggests it badly requires a Visual Studio 2005. We searched in Microsoft community but couldn't find it.
Visual Studio 2005 can currently only be downloaded when you have an existing Annual (Standard) Visual Studio subscription. Or you need to find original retail media (DVDs).
You can find it here in that case.
The latest set of updates for Visual Studio 2005 can be found here.