When burning "live" mp3's to a disc - with Nero - I always set the gap between 2 tracks to 0 seconds. That's the best way for me to get a complete concert as "one" track on a disc.
But..... between the 0-second-tracks you can hear a short click. Not very disturbing but also not perfect.
Is there an other way to paste tracks to each other without the hick-up?

In addition to apply 0-sec gap, you'll also need to try a crossfade of 4 or 5 frames.

my oem version of Nero doesn't have the crossfade option.

Yep, OEM Nero versions don't. You'll need to obtain a full-version serial number then enter this new S/N into the Nero you have. (Run Nero, click on Help then select Enter New S/N option.) When a full-version S/N is used, you'll have all the options enabled.

Van Nugent, thank you very much for your help.
I will try it.