I don't know why you're having trouble downloading any of those files because they're attached on our server. Even the basemap is in 3 RAR parts on our server too. Maybe your browser's ad blocker is interfering or you have a third-party antivirus software which is overly protective. Maybe just try QuickCure3 first, it's universal and very simple to use as it doesn't require the original device firmware at all. Being a relatively small file, i've made a folder 'pack' for you with both the correctly named RGN file and Updater.exe and uploaded in a ZIP file elsewhere so you shouldn't have any difficulty downloading it. The link to it and a 'how-to' are behind the spoiler. If it works (doesn't always) you won't need to make Cure3 firmware at all. Seeing you said you're not 'a pc whizz kid' I've been overly pedantic in the how-to to be sure you get it right.
Spoiler:
If it doesn't work then you'll need full Cure firmware made from the device's firmware which we can walk you thru so no problem there, just a bit more complicated. Don't worry, this device is fixable unless it's got a physically damaged flash which is highly unlikely.
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