This is a security feature of the portable edition. The portable edition goes to great lengths to avoid storing any temporary files or application data anywhere on the local machine.
Now if this is a non-security concern there is a way to override the temporary file locations in the portable edition.... However upon testing this scenario I discovered an unexpected issue and the feature does not work as expected for your situation; %TEMP% is expanded prematurely and the value of %TEMP% is written to the data file which fails on portability, Also we can't just use %TEMP%, we need to create a folder within %TEMP%\~flashfxp\ and this sub-folder does not automatically get created.
I am working on correcting these issues now. I can send you a link with the fix when ready if you want to test it out.
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