Using Stardock Central I installed WindowBlinds 10.5
People seem to have better luck downloading the executable from the "My Downloads" page and installing from that. Here's the procedure I use to install, there may be a couple of unnecessary steps in there but it has been rock-solid-reliable for me:
Download the new version from your account page:
https://store.stardock.com/login.aspx?ReturnUrl=/myaccount/products
Copy off any modified shipped skins you want to keep.
Apply the default Windows skin to all logins.
Temporarily disable your antivirus
Deactivate the currently installed version of WB from within WBConfig
Uninstall the currently installed version of WB
Reboot
Temporarily disable your antivirus
Install the new version of WB
Activate the new version of WB
Reboot
Re-enable your anti-virus