None of the vb 4 plugins work in vb5.
Before moving to vb5, remove all plugins that use vb4.
In vb4, shift the files in the topics to the database from admincp.
Completely delete the vb4 files found in ftp.
Upload vb5 files to ftp.
It asks for database information during installation, enter the database information of vb4, after entering it, the update will start.
Important: take a backup beforehand to restore vb4 on any error.
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