If the latest version of EP4 (downloadable from here) is "installed" and the above issue is occurring, then I would suggest verifying that the files have been loaded to the correct location. The files (and folders) of the download's admin directory are to go into your (renamed) admin directory. Once they are placed there, then on next navigation of the admin window, an option should appear in the tools menu to initiate access to Easy Populate 4.
As to your install from your host, suggest that you attempt to go through a checkout process to verify that all necessary/applicable files and database options have been applied. Most "auto-installers" (none are written by ZC) seem to miss one or more things. The suggested route is to manually install the software available from this forum website at the home page. That installation though should not effect the ability to install EP4.
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