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This is not my invention.
I found a very useful comment here, about how to make the software portable. I don't know why but the original poster's comment was deleted (maybe he deleted his own comment) so I post the script again.
This is the script:
%~d0
cd %~dp0
set QT_PLUGIN_PATH=%~dp0
start otter-browser --portable
Copy in a text file, change the .txt extension to .bat, put in the browser's folder and run the file. Otter will push through and creates two folder in his "den": profile and cache. Anytime you want to use in portable mode, run the .bat file.
Have a good time