tried no of times …still stucking at downloading 100%.
Had the same issue with OP 6T. It took around 5 minutes for the installation to complete even after reaching 100% like in the screenshot. If it is not working, just disconnect, reconnect the phone and try installing it again.
I think it’s just a visual glitch or something. Same thing happened for my 7T, just retry the installation and wait a bit longer when it reaches the 100% mark.