I bought Deskscape 10.02 some time ago. I paid the full price for the complete Desktop Manager experience. Everything worked fine for a month; once my windows 10 got the 1st update, Descape stops working and shows me the message "DECODER NOT FOUND." At that time, I had a 1 year of service support subscription, and when I requested help, they just sent me here "Community Forum." Terrible customer service experience. I have a few casual friends asking me for the application because they want to make their computers look similar to mine (Few pictures posted). Still, I explain the situation, show new pictures, and recommend not buying this product. After that, I just come here at least every 3-4 months to know if there is a solution to my issue without results. If you are reading this, don't lose your hope. Someday somebody will find the root of the problem and will publish the solution. Probably before the apocalypse or windows newer update, whatever is worse.
I am unsure why you posted in this thread about Deskscapes 8.x which has a known problem with later versions of Windows 10 given you have Deskscapes 10 which does not have that problem. The problem being OS level changes rather than with DS8 which works fine on the OSes it was designed for.
With regards to your issue, decoder not found has two possible reasons.
1) You are trying to play a video dream that uses MPEG2 video which some older ones do. Later versions of Windows do not include MPEG2 decoders for licensing reasons.
2) Files are not being extracted correctly from dream files. This was an issue for some people in the original 10 release, but this has been resolved in later versions. You can tell if this is the case if none of the included dreams work. Static wallpapers should however work in this situation still.
Extra debug information was added to DS10.02 so we could track what was going wrong with file extractions. If you are having issue two then please do post back and we can collect additional information to see whats going on for you.
The reason for community forum support is it acts as a knowledge base. Unlike some community forums, these forums are still monitored by people who have the ability and power to resolve issues.
As best I can tell you posted once about the issue and were asked to try the latest build and let us know if it didn't help and no further posts were made which would by why no further help was received as we didn't know you still had an issue.