I, was thinking about downloading 1.3 Bitcomet will it change everything i have set up 1.29
Nope. But it’s always a good idea to make a backup prior to upgrading anything.
Nobody can guarantee you that nothing will go wrong.
Please post in the proper forum.
topic moved
Absent very unusual circumstances, upgrades (or downgrades) of BitComet are seamless and trouble-free. You just install the desired version right over the existing version, and continue without a hitch.