Emu XL-7 & MP-7 User's Group

Trying to upgrade an MP-7 from 1.18 to 2.0.  Using a Windows XP PC this time (gave up on using MAC OS 9 Classic--can't open e-loader).

Downloaded and installed e-loader, and it looks functional.  Downloaded the 2.0 dli file from the E-Mu site as well. 

But I can't get a complete download of OS 2.0 to the MP-7 before the download fails.  

The download request from the MP-7 works, I start the download from e-loader (it says the complete download is 557331 bytes), but it fails every time, at different stages of download.  

Error message on PC says download filed.  Error message on the MP-7:  "Error Downloading MIDI:  Wrong Length."

Tried many times; the failure occurs at different points in the download:
1904 bytes
9072 bytes
43680 bytes
100800 bytes
3584 bytes
52976 bytes
18592 bytes
55216 bytes
11872 bytes
etc.

Is there some MIDI setting on the MP-7 that has to be set?  I've tried varying the MIDI Sysex Packet delay, for example (it can be set from 0 milliseconds to 8000).  I've also tried changing the Sysex ID from 0 to 1.  Download fails the same way every time, at different points in the download.

Since the e-loader software seems to work, and at least part of the download works, it looks like the problem is in the MP-7--but this one is in pretty good shape.  Any ideas...?  How do people get this to WORK...?