Hello Swaminathan.R,
1. Issue 1: About update MCUxpresso Config Tool on IDE, it seems we can only use online mode.
2.Issue 2 and Issue3, please delete the update site which error remind :

use the websites below:

http://download.eclipse.org/tools/cdt/releases/9.4
http://download.eclipse.org/releases/oxygen/
http://mcuxpresso.nxp.com/staticdata/updates/kex_ide_5.0/
http://www.nxp.com/lgfiles/updates/Eclipse/mcuxpressoide/v10_3/
http://www.pemicro.com/eclipse/updates
Then check whether it can work well.
Have a great day,
Alice
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