no,don't just use 'move' option, it will cause a few headaches...the basic procedure is this (similar to installing Bill Lyon's 'Golden Wings')
1)temporarily rename the fs9.exe program on your 'c' drive to something like fs9.exe.bak (this allows installer to work)
2) install fs9 (using all the cd's and any update) to your 'd' drive
3) then cut and paste contents of 'c' fs9 folder except for scenery.cfg, scenery.dat and the renamed fs9.exe.bak to 'd' fs9 (fs2004) folder, overwriting any existing folders etc.
4) for add-ons ( I don't have UT) you'll need to re-run their installers to point them to the new fs9 location
5)finally restart fs9 and add-in all the add-on scenery via the settings/scenery library options (this avoids getting cfg errors on start up as old scenery.cfg will be pointing to a no longer valid location.)
6)only when 100% happy delete the c drive fs2004 folder and its' contents
if youre not 100% confident that you won't mess up somewhere, then leave it (fs9) where it is.
hope this helps
ttfn
Pete