3
You current server is running php 5.x right?
Download xampp or wampp or whatever you need to run a local setup with server,php and database.
Install your site locally. Upgrade to the current XOOPS 2.0.15. (update modules also if applicable)
Then upload that site to your new server.
You can find a listing of different Xampp versions
here to find one with php 4 / MySQL 4.
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