Unable to start migration from Helm to Plesk:
Error: Error on call plesk-migrator callback "D:\Program Files (x86)\Parallels\Plesk\/var/modules/panel-migrator/sessions/20151116173517/config.ini" --command="generate-migration-list --skip-services-checks"
However, panel migration was put into
C:\panel_migrator\panel-transfer-agent and running on the server.
Telnet to the source server port 10155 is possible.
An attempt to migrate from Helm to Plesk via GUI. Only Plesk-to-Plesk migration is available from GUI. Migration from Helm 3 is available only via CLI.
Migrate using command-line utility, as described in Plesk Migration guide