I installed LL 5.x on Windows 8.1 and had a look to the profile folder. According LL wiki (https://wiki.documentfoundation.org/UserProfile) the folder should be "%appdata%\LibreOffice\4\user" for LL 4.x so logically it should be set to "%appdata%\LibreOffice\5\user" for LL 5.x.
Same issue found on Linux platform, Version: 184.108.40.206, Build-ID: 00m0(Build:2). After update from 4.x to 5.x the path is set to "/home/<user name>/.config/libreoffice/4/user" instead of "/home/<user name>/.config/libreoffice/5/user".
A look to the preferences -> paths confirms this wrongly set path.
Thanks for the issue. Basically this is a dup of bug 93057.
But indeed, the userprofile wiki needs an update too..
Cheers - Cor
*** This bug has been marked as a duplicate of bug 93057 ***
(In reply to Cor Nouws from comment #1)
> But indeed, the userprofile wiki needs an update too..