I have got the same problem, but it doesn't fixed itself by trying to import the 32bit version.
I tried to import this package with sepm version 1.12.3. After failing several times I updated sepm to version 1.12.4. The update went good but the package import failed for 32bit and 64bit in the process. I tried to import the package manually with the same error as descriped in post one. after importing the package the scm-ui log file wrote following:
06.12.2013 12:58:00 STDOUT: CurrentPackagePanel>> valueChanged: m_curSelectedRow=0
06.12.2013 12:58:00 STDOUT: Password safe on for domain : default
06.12.2013 12:58:00 STDOUT: Password safe on for domain : default
06.12.2013 12:58:00 STDOUT: A background query operation was cancelled by user.
06.12.2013 12:58:00 STDOUT: >>> getGroupPathsMapByPackageId: [5BF3430CFDE673C1A5609D05C2A3F07D, null] Duration: 0.038s (38.0ms)
06.12.2013 12:58:00 STDOUT: >>> getGroupPathsMapByPackageId: [5BF3430CFDE673C1A5609D05C2A3F07D, null] Duration: 0.037s (37.0ms)
06.12.2013 12:58:43 STDOUT: OK clicked, validating user selected file or dir...
06.12.2013 12:58:43 STDOUT: CreateNewSoftwareDlg>> isValidate()-> dirName D:\Symantec_CLIENTS\Source\part1\NEU\SEPM\Packages\SAV64.infois validated
06.12.2013 12:58:43 STDOUT: Password safe on for domain : default
06.12.2013 12:58:43 STDOUT: CreateNewPackageWorker>> doWork-> Source dir is...D:\Symantec_CLIENTS\Source\part1\NEU\SEPM\Packages\SAV64.info
06.12.2013 12:58:43 STDOUT: CreateNewPackageWorker>> doWork-> Reading meta data...
06.12.2013 12:58:43 STDOUT: Checking binary file integrity...file=D:\Symantec_CLIENTS\Source\part1\NEU\SEPM\Packages\SAV64.dat
06.12.2013 12:58:43 STDOUT: Checking binary file integrity...Done
06.12.2013 12:58:43 STDOUT: SoftwarePackageHandler>> addPackage: Begin...
06.12.2013 12:58:43 STDOUT: Software Package Handler.isPackageExisted newBinaryFileID>> 04D51F79BFFEF3DE733D1159688A29AC
06.12.2013 12:58:43 STDOUT: Software Package Handler.isPackageExisted newBinaryFileID>> 04D51F79BFFEF3DE733D1159688A29AC
06.12.2013 12:58:43 STDOUT: Existing LUcontent array size:3
06.12.2013 12:58:43 STDOUT: SoftwarePackageHandler>> addPhysicalFile: Begin...
06.12.2013 12:58:43 STDOUT: Begin to add PhysicalFile Data (remote): 04D51F79BFFEF3DE733D1159688A29AC, D:\Symantec_CLIENTS\Source\part1\NEU\SEPM\Packages\SAV64.dat
06.12.2013 12:59:36 STDOUT: PackageWorker>> construct: Done!
06.12.2013 12:59:36 STDOUT: Done PackageWorker!
06.12.2013 13:04:06 STDOUT: is Export Request: false
06.12.2013 13:04:06 STDOUT: PackageWorker>> after dlg, isAllDone=false
Is there anyone who knows how to fix that? I need the new version asap because it fixes a huge problem with symantec and roaming profiles.