USMT (User State Migration tool) source file location in SCCM 2012 R2

1. Logon to your Primary site server
2. Open Windows File Explorer
3. Browse to C:\Program Files (x86)\Windows Kits\8.1\Assessment and Deployment Kit\User State Migration Tool\
3. Choose amd64 for x64 machines or Choose x86 for 32 bit machines

4. Copy the source files onto DML then create a package based on the requirements