after installing Bandicam on your reset PCs, you will be able to activate it just like you did way back when.
I'm referring to the License Management
(section 3) of the Registration and License FAQ page
I hope this proves helpful to you.
Thank you for reading my post. I hope you understand my "English".
I'm the German translator for some of Bandisoft's products and websites
(mostly Bandicut and Honeycam).