If you are replacing a PC that was using iPOS Pay, you will need  to copy the config folder for the app - this has all their settings. 

C:\ProgramData\iPOSPay

Your first step is to install the app on the new PC, then copy over the entire contents of the old iPOSPay config folder to the new PC. The download link is

https://www.incontrolpos.com/downloads/micros/iPOSMicrosPayNETSetup.zip

Don't confuse the Program Files folder with the config folder noted above. The Program Files\iPOSPay  or Program Files(x86)\iPOSPay folder only has the app DLL and EXE's needed to run it and has no end user settings.

Note, if you can't see the Programdata folder, you will need to adjust the folder view settings to include hidden files and folders.