Has my version of the Visual C++ compiler become obsolete and I need to re-install it?
You can install it alongside your existing if you want - although as it's ancient and not working I'd just uninstall it. Note that by default c++ is NOT installed. You have to modify the install options to get it.
Thanks. Revising my program for the 22 compiler has proved to be a long job, so I again tried to access my old Visual C++ compiler, and it wanted me to renew something, and it told me to ask for a single-use code -- and this time the single-use code was emailed back to me within a minute. (The project that I accessed :: some of its files have an icon with a 14 in its top right corner.) The project compiled in Debug mode correctly first try. Thanks.