To get a specific file without installing UltraEdit you can use the MSI installer packages of UltraEdit
Download the ZIP archive and unpack the file ue_english.msi.
With WinRar you can now select the file ue_english.msi and click on button "Extract To" to extract all the files in the package to a temp directory. The file you are interested in is readme.txt121
If you have Total Commander you can do same when you have installed also the MSI packer plugin. Then a simple double click on ue_english.msi opens the MSI archive. You can see some files and the important one is Cabs.w1.cab. A double click on this file and the MSI plugin extracts the cab file to a temp directory and then Total Commander reads its content with its built-in CAB unpacker. Pressing key F3 on the selected file readme.txt121 forces Total Commander to unpack this file from the CAB archive and displays it with the lister.
If you don't have WinRar or Total Commander with the MSI plugin, I'm sure, all you need is already installed on your Windows computer to unpack the MSI archive without installing it. But I don't know the commands and command line parameters to unpack a file manually from an MSI package. I have purchased WinRar and Total Commander, so I'm not interested in the complicated way to unpack a file from an MSI archive.
Well, you can also contact IDM support per email and ask for the readme.txt of UltraEdit v13.10a.