First boot from Flash and then copy the file enigma2-plugin-extensions-barryallen*.ipk to /tmp with ftp (TCP/IP must be working already).
If you have an image in Flash that offers a Blue Pannel Manual Addon Install, then you can use this functionality to install the ipk file.
If not, then install Barry Allen by entering the following commands in a Telnet session:
cd / ipkg install /tmp/enigma2-plugin-extensions-barryallen*.ipk
Then restart enigma2 and the Barry Allen Plugin shoudl show up under Games / Plugins.
In the Images installed by Barry Allen you don't have to install the Barry Allen Plugin anymore. The Barry Allen Plugin integrates himself into then automatically during the image extract.
And you can remove Barry Allen if you are booted from Flash:
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