Thanks, didn't even know that was there. I've installed the player fine, just the contents. It said on the email that that the service centre would be in the file with the downloader. I looked up the Service centre and it didn't say it was valid from Windows 10, so I thought best to wait.
Logging the call to give them the crash report was a faff. It didn't have an option for Kontact 5 just 4, as far as I could see, but there were hundreds in one drop down menu without alphabetical sorting.
Trying to find third party stuff seems cryptc on their site too. I was looking at Sonic Couture and Sample Modeling on their site earlier, but I have no idea how I fund that before.

. Their search won't find them.
They seem to rely on the new customer knowing their stuff, rather than laying it out for a new customer to find it intuitively.