Hi Bernardo.

Installing the SP1 for Microsoft Visual C++ should not cause any problems with FSX or the add-ons. More than one version of it can be installed on your computer at one time, or it appears that it can because many add-on aircraft will install it during the installation (see attached image).

I would have thought that if MS Visual is installed on your computer and there is a service pack for it, it would automatically be updated if you have your update turned on.

My advice would be to install the SP1.

Mark

---