Here's my progress with the CF card over the last few days.
I went to the Amiga North Thames meeting on Sunday. From what I was told, it was a record breaking attendance, so I hope there are even more people there next time.
I asked one member about this problem with DPaint IV 4.5 AGA crashing and he compared the floppy disk and HDD startup sequences. Another member (whose name I've sadly forgotten) chipped in that the problem may be that the MaxTransfer rate needed to be reduced. This advice had come up in one installation video by retrosofer on YouTube, but not in another video of his which I finally used, and my installation hadn't even brought up a screen which mentioned MaxTransfer. This number was changed to something like $1FE000 , then DPaint IV 4.5 AGA was copied onto the CF card again and it worked! The problem may have come up with this version of DPaint, but not an earlier version or any other software, because it may have been a larger file to any of the other programs already installed.
The following day, I did some more work copying software onto the CF card. I finally unscrewed my A1200 again and removed the CF card. I inserted it into a CF card reader/writer and managed to add it as a hard drive in WinUAE. This was only after I failed to get UAE and E-UAE (both under Linux) to run, though. I had various problems with Kickstart ROM images under WinUAE and finally had to use it to run as an A500 Plus with 4Mb RAM. I managed to install the applications Personal Paint, and Platinum Works!, as well as the games Colonization, and The Secret of Monkey Island. I had problems finding the best version of Monkey Island, because the first version wasn't cracked and I haven't got the manual. It was in German, which doesn't bother me, but I didn't know which year various pirates had been arrested or killed, so I couldn't play the game. I installed another version, which has been cracked and is in French, but that's OK with me. I may even learn some new vocabulary! I couldn't install The Bard's Tale, or Gods. These may both require WHDload or something similar. I think another game called Colony1 may just require an assign.
I looked at the extracted archive of WHDload and didn't see how I could install it. It later dawned on me that I'd probably need to compile it all into an ADF file. I can't understand why it hasn't been supplied as an ADF. I hope to get that done today.