For reminder, the PanelRedirect plugin allows access to the control panel through standard HTTP ports (80, 443) instead of specific HTTP ports (8880, 8443).
This plugin is a bit of useless with latest i-MSCP Serie because it is possible to achieve the same thing using the core features:
Adding the control panel domain as customer domain or subdomain
Enabling the redirect feature as follow:
URL forwarding: Yes
Forward to URL: http://<panel.domain.tld>:8880 or https://<panel.domain.tld>:8443 if SSL is enabled for the control panel
Forward type: PROXYPreserve Host
Note that you need at least i-MSCP 1.4.4 version in which a bug regarding the redirect feature has been fixed.
Thank for your understanding.
Source: i-MSCP release