Up gradation of fedora 8 to fedora 15
 

I have downloaded fedora15. Want to know how to up grade my system?

I would go for a fresh install.

Kind regards

probably, from 8 to 15? fresh install

And I would install fedora 16 -- the current version
fedora 15 will hit end of life in 5 months

and 15 was a bit buggy , so if you do install it, install a bare bones.
There will be about 3+ Gig's of updates to 15 .

Back in 8 the recommended was to clean install.

If you insist, I'd go from level to level say 8 to 9 then 9 to 10 and so forth rather than a single jump.