First, many thanks John, for replying on a holiday Sunday! I appreciate your prompt willingness to help. The PC I have is a bogstandard Compac and I also have bought a bogstandard HP Pavilion dm1 which not only has 4Gb RAM but will open flat for use on a music stand. The Compac has Windows 7 Pro and the HP has Windows 7 Premium Edition. They are both working perfectly. I don't think my hardware or my software is the problem. Yes, I have installed 1.08, but your webpage (called "Latest Release", though you call it Resource Page, which is confusing) says to install 1.0.4 via the Resource page but the link does not work and drivers are not on any page called Resource Page (there is no such page in your website) so maybe your website is out of date and needs clearer headings.
I also have installed Resource file 1.0.0 and it may be a good idea here for you to suggest to users that they download the six segments simultaneously since that is much quicker (about an hour) than downloading the entire program in one go (six hours).
Pleased to hear that I can keep earlier versions on the PC without interference with upgrades. That eliminates one possible reason why the upgrade is not working on my kit. As I said, after I reinstalled the original 1.4.12 eigenD the Pico worked fine again, so I suggest that there is nothing wrong with my set up. I had hoped that the upgrade to 2.0.x would solve the intermittent crashes I get even though I have 4Gb of RAM. Am I right in understanding that although there is a lower memory requirement the 2.0.x upgrade will not perform any more efficiently and that the only changes are the Strummer etc programs? Do you think that if my HP dm1 can be upgraded to 8Gb RAM this might cure the problem? Are any other Pico users facing this hungry RAM problem, perhaps? Finally since the 1.4.12 version of eigenD works fine on my Pico this eliminates the possibility that the Pico itself has any hardware fault.
Thanks for organising the refund. I have spent about fifteen fruitless hours trying to get the upgrade to work, and I leave you to imagine my disappointment. Maybe in a year or so the 2.0. x upgrades will have eliminated these infuriating bugs. Meanwhile, if you like, I will bring my Pico and my computers down to Devon from South Wales so you can learn the nature of this bug better at first hand.