Cannot install PMS after upgrade to DSM 7

[ChuckPa]

@mikedutch

Installation Type and “Use PMS internal storage” Location of PMS logs and letting Pathname… default. Error message “Preinstallation checks have failed.”

Perhaps this will help. It’s a walk-through , with screenshots ?

DSM 7 - Plex Media Server - Release Info & Migration instructions

Plex Media Server for Synology DSM 7 - Release This document is to share changes made with DSM 7 and resolve any unforeseen issues before you attempt migrating to DSM 7 for Plex use YOU ARE URGED TO READ THIS THREAD COMPLETELY BEFORE PROCEEDING OR ASKING QUESTIONS DO NOT INSTALL Synology BETA software UNLESS INSTRUCTED. This thread is a LIVING document. Expect it to change. Synology’s DiskStation Manager (DSM) has undergone significant changes in version 7.0. Many of those changes affected …

You are missing the required steps where you give the new username Full Control of the existing Plex shared folder (DSM 7 requirement)