After HD replacement, MSFS will not start anymore (was running well before)

Hi NormalMonkey204,
thanks for your response but unfortunately it does not help. I found the setting meanwhile as well and saw at the end the path, but is says exactly that what I said: “f.\FlightSim”
So, no reason to do here any changes.

Meanwhile I plugged in my former NVME (it’s not deleted so far) via external USB. and even switched the drive number internally, so that the former drive had exactly the drive number like before. - No solution

I removed it again and renamed my new drive back again to f:\ and even changed the name (but this doen’t made sense for me anyway, because a drive is gonna be located by it’s number (in this case) f:
and not by his name and - as I thought already - No solution.

The only thing is, what I can test first - (if there won’t pop up an other sollutions here) and before I HAD TO INSTALL AGAIN grrrrr - is:
replacig the new NVME by the old one agian. But finally it’s just a crosscheck solution and I would avoid this as well since this is finally not my aim to keep the old NVME and means as well doing some hardware changengs since the NVME has really to become “installed” onto the motherboard and not just “pluuged in” like an external USB or similar.