Wow. So much friendly help and no trolling yet. Who would have believed such a place exists on the internets.
I used Windows media creation tool.
I donĀ“t wanted to use my existing USB Sticks. They kind of where tailored to purposes.
First try:
I had an adapter from SD card to USB. It was fed mith a micro SD card.
So basically: 8G Micro SD card < adapter from Micro SD card to SD card < adapter from SD card to USB.
It appears messy, right? =) Dont worry it gets more messy before it gets better.
But this solution was considered usable by Windows media creation tool.
When this messy solution was at ~99% finished in Windows media creation tool, my backup desktop PC shut down, because of overheating.
I fixed that overheating issue.
2nd try:
Then I restarted the boot device creation with Mr. Messy bootstick. BTW this process takes about 2 h with my i-net connection.
This time it finished.
But the barren laptop could not boot from this improvised messy stick. I counterchecked with a Win7 installation boot stick. This one worked.
3rd try:
So I overcame my lazyness and cleared a USB stick.
From this one, right now, Win10 is installing.