It is expected that next release of ORCA revision will solve this bug, at that time, I will update Multiwfn, then this difficulty will be perfectly solved.

Now, I have managed to have GBW, OUT and JSON file in MultiWFN folder.
After starting MultiWFN, a pressed 18, 16, defined fragments, pressed enter to load OUT file. There was this report:

Found tddft3.out
Note: This file is recognized as an ORCA output file
There are  200 excited states, loading basic information...

Loading configuration coefficients...
tddft3.json was found in current folder, Multiwfn will load configuration coefficients from this file instead of from ORCA output file
Unfortunately, the present reference state is closed-shell, json file cannot be
  loaded
Still load from output file!

Warning: For TD task, ORCA does not print configuration coefficients to output file but only print corresponding contributions of each orbital pair, in this case Multiwfn determines configuration coefficients simply as square root of contribution values. However, this treatment is evidently inappropriate and the result is nonsense when de-excitation is significant (In this situation you have to use TDA-DFT instead)
If you really want to proceed, press ENTER button to continue
   IMPORTANT HINT: The perfect way of solving this issue is loading TD configuration coefficients from json file, see ORCA part of Section 3.21.A of Multiwfn manual for details

So there is something wrong: " Unfortunately, the present reference state is closed-shell, json file cannot be loaded"

I am studying organic radical with multiplicity 2.

My ORCA input was as follows:
!CAM-B3LYP D4 def2-TZVP def2/J RIJCOSX TightSCF defgrid3
!CPCM(acetonitrile)
!KeepDens
!KeepTransDensity
%tddft
nroots 200
tprint 1E-8
DoNTO true
TDA false
CPCMEQ true
Restart "tddft.gbw"
end

* xyzfile 0 2 geom.xyz

Please help, how to proceed.

Please put the file into current folder and retry. Alternatively, directly inputting correct full path of your ORCA output file, then Multiwfn must be able to find it.

In addition, your use of tddft2.json is incorrect. After successfully loading tddft2.out, if Multiwfn finds there is tddft2.json in current folder, Multiwfn will automatically use it.

but info which look like this:

"TD-DFT": [
      {
        "Energy": 0.11071829082607708,
        "IRoot": 1,
        "OrbWin": [
          72,
          222,
          223,
          1731
        ],
        "X+Y": [
          -9.53692094056872e-06,
          7.542614463640424e-07,
  ...

I used ORCA 6.1.0 or 6.1.1 to calculate TD-DFT spectrum with "TDA false".

Then, I followed instructions to create JSON file (section 3.21 Electron excitation analysis (18))

However, when I run Mutliwfn (Multiwfn_2026.4.10), I have problem:

I used:
Multiwfn.exe tddft2.gbw
18
16
defined 3 fragments

Then:
Input path of Gaussian/ORCA/CP2K output file or plain text file, electron excitation information will be loaded from this file, see Section 3.21.A of manual for detail
e.g. C:\lovelive\sunshine\yosoro.out
Hint: If pressing ENTER button directly, the file with same name as input file but with .out or .log suffix will be loaded

Error: Unable to find either tddft2.out or tddft2.log

So I directly set tddft2.json

Error: Unable to find either tddft2.out or tddft2.log
tddft2.json
Note: This file is treated as a plain text file
Error: Unable to locate "Excited State" label
Press ENTER button to return

Is there any workaround?

Thank for help in advance