the problem is file maked with OAUKX not need be encrypted with algorith 111 like originals of Lineage2 so umodel no detect nothing there, about your files I found in net and are encrypted with a tool of russian programmer, without this tool you can't get back the file.
Testing Files
Opening
******** C:\Users\Enzo\Desktop\Demon\Client Files\animations\2hs_DemonAge_by_a6y.ukx ********
ERROR: Package "animations\2hs_DemonAge_by_a6y.ukx": wrong name index 63
UnPackage::SerializeFName:pos=00000184 <- TArray::Serialize:0/49 <- USkeletalMesh::Serialize <- LoadObject:SkeletalMesh'2hs_DemonAge_by_a6y.2hs_DemonAge_by_a6y', pos=184, ver=123/31, game=2000 <- UObject::EndLoad <- LoadWholePackage:2hs_DemonAge_by_a6y <- Main
Exporting
******** C:\Users\Enzo\Desktop\Demon\Client Files\animations\2hs_DemonAge_by_a6y.ukx ********
ERROR: Package "animations\2hs_DemonAge_by_a6y.ukx": wrong name index 63
UnPackage::SerializeFName:pos=00000184 <- TArray::Serialize:0/49 <- USkeletalMesh::Serialize <- LoadObject:SkeletalMesh'2hs_DemonAge_by_a6y.2hs_DemonAge_by_a6y', pos=184, ver=123/31, game=2000 <- UObject::EndLoad <- LoadWholePackage:2hs_DemonAge_by_a6y <- Main
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