FeedDemon is not portable, so I have created a portable launcher for it. Download the ZIP package and extract to a folder of your choice. The folder structure is as follows:
Then download FeedDemon and extract its contents to a temp folder. Copy all files from {app} to the App\ subfolder under the launcher. Launch FeedDemon.exe.App\
Data\
jauntePE.dll
FeedDemon.exe
FeedDemon_jauntePE.ini