Thanks a lot Sir,
(I should have followed this before, but because some others expressed doubts, so I could not get the courage to go thru' those long 22 steps)
BUT, that 9 th. step enabled me to remember to create a new "footprint" folder in my E: drive, & after following the rest of the 22 steps, I successfully downloaded the libraries in that new folder.
& now, for the 1st time, in my history of using KiCad, the net-list generation time, was reduced from 5 minutes to 3 seconds...only...!!....WoW....!!...- ..
(I think, the: "As of yet undefined CvPCB trouble" heading here, can perhaps be modified now?)
(NOTE: I think, the internet speed & density of users in an area, could be taken into consideration, in such KiCad, net related problems. In high net-speed areas, or such countries, the 'net-list' may be generated as fast from the net, as it is from the local drive. But in my kind of area, the time difference may be very large, at least, that is what I think, I have seen today)