This is frustrating, but my B/Cam keeps reverting back to un-registerd. Every so often, I have to resubmit my registration key. What's up with that?
It seems to have something to do with pinning it to my taskbar. I like to have it in my taskbar because I use it so much. I hate digging down through all that stupid list of apps on the start menu to find B/Bam.
But when I pin it to my taskbar, it goes along ok for a while, then all of a sudden when I initiate the app, it comes up as an un-registered version. BTW, there are not duplicate versions on my PC. There is only one application of B/Cam on my PC. I made sure of that by doing a search for all files.

Hello bandiuserinSC,

Please uninstall it and download the latest version of Bandicam from https://www.bandicam.com/downloads/ and then install it with Administrator's account and follow the registration process.
https://www.bandicam.com/faqs/how_to_pu ... er_serial/

After that, you will be able to use the full version of Bandicam even in Non-admin mode or safe mode.
If you still have the same issue, please contact bandicam@bandicam.com.

Thank you.