MAME Compiler with 148u2

Any reason why I can't recompile 148u2 with MAME Compiler 64? I get to step #8 and get:
 
Applying Diff Patch...
Error Applying Patch.
PatchDiff(): The directory name is invalid
 

• Download MinGW from here and extract to C:\MinGW (I extracted to D:\Apps\MinGW)
• Install Mame Compiler (Installed to D:\Apps\MAME Complier 64\)
• Create a folder C:\MinGW\source\Mame0147u3 (Created D:\Apps\MinGW\source\Mame0148u2)
• Download the hiscore hi_147u3.txt from here and copy it into the C:\MinGW\patches (you can rename it to
      hi_147.diff if you like but it doesn't matter) (Downloaded the 148 hiscore and moved to D:\Apps\MinGW\patches)
• Download the mame0147s.zip from here and extract to C:\MinGW\source\Mame0147u3 (Downloaded mame0148s.zip and extracted to D:\Apps\MinGW\source\Mame0148u2) This leaves me with mame.zip I'm assuming it needs to be extracted again?
• Download the updates from here (0147u1_diff, 0147u2_diff and 0147u3_diff) and extract them to C:\MinGW\patches (Downloaded 0148u1_diff.zip and u2_diff.zip and extracted to D:\Apps\MinGW\patches)
• Download MameUI source from here extract somewhere then copy the src folder to C:\MinGW\source\Mame0147u3 (Downloaded the MameUI 148.2 source and copied the src folder to D:\Apps\MinGW\source\Mame0148u2 overwriting the previous files in src)
• Apply the official Mame patches 0147u1_diff, 0147u2_diff then 0147u3_diff. Apply them by browsing to each one selecting it
      from the file browser then selecting "Apply Patch"
• Now apply the Hiscore patch you downloaded from step 3 (Eg.
      hi_147u3.diff or hi_147u3.txt depending on how you saved it)
• Set your "Mame Source Folder" to C:\MinGW\source\Mame0147u3
      and check you have the WinUI build option selected under OSD
• Click GO! to compile.

Z

Edited: typo extra quote in path above