Transmission

No, it is dynamic and related to one torrent job.
You are missing something.

You can not run it manually!!!
You have to download new torrent.

Trasmission app sets these variables for script to use.
That are torrent folder and name.

I checked my log. It is fine.
I did not test script with blank DECOMPRESS_TO_DIR so change it to something like I did.
If it works I will fix script for blank DECOMPRESS_TO_DIR.

It knows through variables like ${TR_TORRENT_DIR}.
My script works fine so you should be able to fix it.
It must be something you overlooked.
Try changing destination dir just for test.
And check settings.json once more.

It has to be 0775, not 0755. You can change it with WinSCP also (F9).
PM is available as the last resort
Actually 0755 should also work.

This should do it "chmod 775 unrar_unzip_script.sh" from within bin folder.

Then it must work with provided script.
One more thing, you have to set file permissions for script to 0775.
Here is the link to script I wrote in post above https://we.tl/cWZjqpARlk

Not sure about the quotes but you should definitely connect via WinSCP and check everything.
4.3.2 is 64-bit so that is the same.

These files are part of operating system.
They are not located inside QTransmission directory.
This is what I have exactly:
"basename" and "find" are links located inside /usr/bin and they point to "/bin/busybox".
"unrar" and "unzip" are inside /usr/local/sbin as I already mentioned.
Everything can ...

I just installed 2.92 and had same problem.
So I adjusted the script a bit and it works.
I copied script to /share/CACHEDEV1_DATA/.qpkg/QTransmission/bin/unrar_unzip_script.sh
Change settings.json in /share/CACHEDEV1_DATA/.qpkg/QTransmission/etc as follows:
"script-torrent-done-enabled": true ...