This guide is addressed to those who administer HELM control panel and would like to perform in-place migration of their hosting data to Plesk.
In-place migration here is a type of transferring data from one hosting panel to another, which is performed within one server. I.e., you install Plesk on the same server that previously ran Helm, and the hosting data operated by HELM is beinf transferred to Plesk during the Plesk installation. When you run Plesk after it had been installed, it will comatain hosting data previously existed in HELM.