Edit the file "Kobo ereader.conf" which I think is in .kobo or in a subdirectory of it.
You need a text editor that does Unix file endings, not a word processor or Windows Notepad. Notepad++ works. Any plain text editor on Mac, BSD, Linux etc will work.
Find
[ApplicationPreferences]
Add
SideloadedMode=true
If it's already there and false, edit it to true.
On Mac, BSD, UNIX, Linux you need to enable view of hidden files & folders because the top directory/folder starts with a dot.
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