This is the log printout from UEd2:
Log: Log file open, 02/09/15 07:51:26
Init: Name subsystem initialized
Init: Detected: Microsoft Windows NT 6.1 (Build: 7601)
Init: Version: 432
Init: Compiled: Oct 4 2000 21:31:15
Init: Command line: -log
Init: Base directory: C:\Program Files (x86)\Steam\steamapps\common\Deus Ex\Ued2\
Init: Character set: Unicode
Log: Bound to Editor.dll
Log: Bound to Core.dll
Log: Bound to Engine.dll
Log: Bound to Window.dll
Init: Object subsystem initialized
Init: Computer: DANIELPC
Init: User: Daniel
Init: Memory total: Phys=4184980K Pagef=4194303K Virt=2097024K
Init: Working set: 32000 / 159000
Init: CPU Speed=2673.374163 MHz
Init: CPU Page size=4096, Processors=8
Init: CPU Detected: PentiumPro-class processor (GenuineIntel)
Init: CPU Features: CMov FPU RDTSC PAE MMX KNI
Init: Unreal engine initialized
Log: Bound to Galaxy.dll
Init: Galaxy is using WinMM
Init: Galaxy initialized
Init: Transaction tracking system initialized
Log: Bound to Fire.dll
Log: Bound to IpDrv.dll
Log: Bound to WinDrv.dll
Init: Mouse info: 0 0 0
Init: Initializing DirectDraw
Log: DirectDraw drivers:
Log: display (Primary Display Driver)
Init: DirectDraw initialized successfully
Init: Client initialized
Log: Bound to Render.dll
Init: Lighting subsystem initialized
Init: Rendering initialized
Init: Editor engine initialized
Log: Startup time: 2.511151 seconds
Init: Input system initialized for U2Viewport0
Log: Opened viewport
Log: Bound to SoftDrv.dll
Init: Input system initialized for U2Viewport1
Log: Opened viewport
Init: Input system initialized for U2Viewport2
Log: Opened viewport
Init: Input system initialized for U2Viewport3
Log: Opened viewport
Log: 4.00 522.00 384.00 257.00
Log: 4.00 522.00 384.00 257.00
Log: 4.00 522.00 384.00 257.00
Log: 4.00 536.00 384.00 264.00
Log: 4.00 536.00 384.00 264.00
Log: 4.00 522.00 384.00 257.00
Log: 4.00 522.00 384.00 257.00
Init: Input system initialized for MeshViewer
Log: Opened viewport
Log: 4.00 536.00 384.00 264.00
Log: 4.00 536.00 384.00 264.00
Init: Input system initialized for TextureBrowser
Log: Opened viewport
Log: 4.00 522.00 384.00 257.00
Log: 4.00 522.00 384.00 257.00
Warning: Failed to load 'C:\Program Files (x86)\Steam\steamapps\common\Deus Ex\Maps\01_NYC_UNATCOIsland': Can't find file 'C:\Program Files (x86)\Steam\steamapps\common\Deus Ex\Maps\01_NYC_UNATCOIsland'
Warning: Failed loading package: Can't find file 'C:\Program Files (x86)\Steam\steamapps\common\Deus Ex\Maps\01_NYC_UNATCOIsland'
Warning: Failed loading package: Can't find file 'C:\Program Files (x86)\Steam\steamapps\common\Deus Ex\Maps\01_NYC_UNATCOIsland'
Log: Matched Viewport U2Viewport0
Log: Matched Viewport U2Viewport1
Log: Matched Viewport U2Viewport2
Log: Matched Viewport U2Viewport3
Log: Matched Viewport MeshViewer
Log: Matched Viewport TextureBrowser
DevAudio: Galaxy SetViewport: U2Viewport2
Log: BspValidateBrush linked 0 of 0 polys
Log: Collecting garbage
Log: Purging garbage
Log: -0.0ms Unloading: Package Render
Log: Garbage: objects: 26388->26339; refs: 285497
>
For some reason, it's not loading the packages.