Thanks Angus. I'd left behind the older BPLs when i removed 8.64. Did a more thorough cleaning job then tried again, "missing" components installed correctly. Still had the problem with VCLZipPack though, so I may not have been as thorough as I should have. When I looked at OverbyteIcsD2007Run.dproj it had a "Contains" for $(%systemroot)\system32\vclzippack.dcp (or similar, can't remember the exact naming). I deleted this dproj and updated the svn, then had a clean dproj without that Contains.
Whilst working on this I downloaded the latest 8.65 zip (for all versions, not the one just for Sidney) from overbyte.eu, to check if there was a Contains in that version's OverbyteIcsD2007Run.dproj for the VclFixPack. There wasn't, but what there is - and I presume it shouldn't be there - is a Contains for C:\Users\angus\Desktop\MagentaXfer2007W.dcp?
Nigel