Thank you very much.
because of choosing option 2 I simply input "C:\S3.fch". Now, for S3.fch will be generated in current folder.
Best wishes

Please make sure that the path you inputted is correct. For example, if you are using Linux version, it is impossible to input such as "C:\S3.fch", because this is not a valid path in Linux.
If after choosing option 2 you simply input "S3.fch", then S3.fch will be generated in current folder.

I have copied all output information of this example to this text file, please check it: out.txt

I did the studies mentioned in 4.18.6 section as following; but the file here does not occur, the program closes and this file does not occur.

''4.18.6 Generate and analyze natural transition orbitals (NTOs) for
uracil
examples\excit\NTO\uracil.fch
18 // Electron excitation analysis
6 // Generate NTOs
examples\excit\NTO\uracil.out // Gaussian calculated three lowest excited states, you can
analyze any one of them
3 // Study transition from ground state (S0) to the 3rd excited state (S3)
.
.
.
.
The highest 10 eigenvalues of virtual NTOs:
    0.865529    0.134025    0.000582    0.000121    0.000063
    0.000024    0.000016    0.000015    0.000007    0.000006

0 Return
1 Output NTO orbitals to .molden file
2 Output NTO orbitals to .fch file

We choose "2
Output NTO orbitals to .fch file" and input the path to output, such as C:\S3.fch. After the .fch has
been successfully generated, you can reboot Multiwfn and load the S3.fch''

S3.fch file does not occur. Can you help me please?