"/tmp/klauncher_background-803463509291224482.sh: line 2: mailpush.sh: not found" seems like a text encoding issue. Did you upload the source files using the Web FileBrowser? If so, you can open and edit the 'mailpush.sh' script in the Web FileBrowser and copy-paste the right content into it. Alternatively, you can try to install the extension via USB.
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