I have completed my trial in Lightroom, in which I have set up my catalogue and presets, i have purchased and downloaded the program but do not want to lose my presets and settings I used in the trial when i install. Will everything transfer over?
If you have been using a trial and have now purchased it, you should not have to download/install anything else. You can use the serial number you receive with the purchase to activate the trial to full usage.
Yes, everything will transfer over and your catalog would remain as is after the purchase.
You do not have to redownload the program.
You can access the same catalog and choose "license this software" to activate it.