I am a novice on this and can't load/install anything but Rx11 from the 7 suite product

Have you tried using the standard install method from where you bought ?

From Native Instruments site : latest version of Native Access for your OS

From iZotope site then : iZotope Product Portal

Else then it could be a problem with your antivirus , a problem with Windows security settings , a Windows system files issue , a MS Visual C++ dependency problem , take your pick. :

Fixing Software Update Installation Issues (Windows)

Use the System File Checker tool to repair missing or corrupted system files

Allow an app to access controlled folders

block third-party app installations in Windows 11/10 (for how to unblock)

If problem persists then please contact respectively N.I. Native Access and Installation Support and iZotope install support

In case that you need guidance contacting support : Please read : how to get support !

What exe?

If you have bought from iZotope site then (sometimes ?) there are installers for downloads as an alternative way of installation , maybe those installer .exe ?