I run FSX A in Win7x64, with the sim in C:\FS10
I bought the VirtualCol Otter, it downloaded, unzipped, installed and flew OK, albeit with some odd numbers showing on the dials. No prob, there was an update in the pipeline.
So I downloaded the update today, unzipped it and ran the exe as admin. It found the original install and announced a successful result.
I started FSX and got "there are multiple aircraft with the same name". I know how to fix that, and I thought I did remove the duplicates, but on re-starting FSX there were only half the original planes available. So I uninstalled, reinstalled to a separate folder, added the update and then copy/pasted to my FS10. This time, the only aircraft listed under Manufacturer=De Havilland Canada was a Twotter. I checked through the complete list in the selection screen but the others were still missing, even though the cfg files looked OK.
So I confirmed FSX's opinion that it wasn't there by deleting the whole lot.
I won't be buying any more VirtualCol products. Their philosophy is good, but the execution is woeful, IMHO.
More in sorrow than in anger,
MikeW