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I wrote to CyberLink Customer Service about this issue.
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I'll bet a lot of other people are having the same issue. I hope these forums are monitored by CyberLink support.
They are your primary source for support. Almost everyone on the forums is a user/volunteer with no access to internal Cyberlink resources.
A couple things you can try while waiting for tech support: Try running the App Manager as an Administrator by right-clicking on the desktop icon (or on the AppManager.exe file in the C:\Program Files (x86)\CyberLink\AppManager folder) and choose
Run as Administrator.
If that doesn't work, uninstall it and then locate the installer in your Downloads folder (you may need to download it again from your CL products page if you chose to Run/Open it directly from the webpage the first time), then right-click and Run as Admin.
It's also possible that you'll get a newer version of the installer by downloading it again. Mine is
ApplicationManager_v0905_rv198726(1_1)_STD_APM180612-01.exe, and it's dated Sept 29, 2018.
Try these out and post back with your results. Good Luck!