[TYPO3] how to upgrade system extension rtehtmlarea? (urgent)

[Tapio Markula]

Bing Du

> [allowSystemInstall]
> If set, you can install extensions in the sysext/ dir. Use this to upgrade
> the 'cms' and 'lang' extensions.> 
> But that seems to only apply to 'cms' and 'lang'?

I thinkt that those are mentioned just as examples.
Allowing that add to any installation new folder option!
Of course system folder is intended just for those plugins,
which are originally installed there.