They unrolled for me. I openned the files and UnrollSrf - See command line history for options used.
H1
H1 Unrolled DC01.3dm (2.1 MB)
Command: UnrollSrf
Select surface or polysurface to unroll ( Explode=Yes Labels=No KeepProperties=No RelativeTolerance=0.1 Warning ): Explode=No
Select surface or polysurface to unroll ( Explode=No Labels=No KeepProperties=No RelativeTolerance=0.1 Warning )
Calculating starting area… Press Esc to cancel
Select curves, text dots, and points on polysurface to unroll ( Explode=No Labels=No KeepProperties=No )
Calculating starting area… Press Esc to cancel
Three surfaces unrolled.
Area is 0.9204 sq inches (0.99 % ) smaller after unrolling
Creating meshes… Press Esc to cancel
H2
H2 Unrolled DC01.3dm (2.3 MB)
Command: _Open
Successfully read file “E:\Downloads E\H2.3dm”
1 open polysurface added to selection.
Command: UnrollSrf
Calculating starting area… Press Esc to cancel
Select curves, text dots, and points on polysurface to unroll ( Explode=No Labels=No KeepProperties=No )
Calculating starting area… Press Esc to cancel
Three surfaces unrolled.
Area is 0.8083 sq inches (0.86 % ) smaller after unrolling
Creating meshes… Press Esc to cancel
Added: I did have to look for the unrolled surfaces. They were not initially in the viewport until I panned.