You must have an "extensions" folder at the same level of the "document" folder.
Inside the "extensions" folder, put one folder for each extension you want:
-document
...
-extensions
--kterm
--....
--skipstone
--koreader
--....
-koreader
NB: koreader needs a koreader folder into the extensions and one koreader folder at the same level of documents (as in the zip)
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