For the installation of software and packages, the Application manager uses a Temp folder in the appdata, local folder of the user. Usually an .EXE file is stored there, executed (for installation) and then the exe file is deleted. I have seen that if something is wrong with users settings, policy settings, access rights to the given folder structure, this MAY have influence on how the process is progressing and being ended. In a normal and regular windows installation, especially when the Cyberlink software has successfully been installed and upgraded through the application manager, everything should work. If not as in your case, then the repair options, as given by Optodata above, may do the trick. Otherwise it would also help to completely uninstall the Application Manager and install it again. If that does not help, and the above repairs do not help, then the communication with support is your option. You may also want to share version information with us here, and include the DXDiag.txt file. And... see what is happening in the temp folder during the downloading and let us know.
(You have used this topic here in version 20, whereas you probably have version 21 as part of the 365 subscription? Maybe use the version 21 forum entry so that more people might notice and help?)