KNOWN ISSUES:

WinCollect agents not installed on C:\ drive can remove entries from the AgentConfig.xml file during an upgrade. APAR IJ32255

After upgrading to QR 7.5.0 UP4, Wincollect 7 agents can experience management or configuration change errors. APAR IJ45284
Due to APAR IJ45284, WinCollect version 7.3.1 P2 will only work with QR 7.5.0 UP4 and only up to QR 7.5.0 UP7. WinCollect 7.3.1 P1 will only work on QR 7.5.0 UP3 and below.

After upgrading to QR 7.5.0 UP7 IF5, WinCollect 7 agents can no longer receive updates from encrypted QRadar Managed Hosts. DT269649
Due to DT269649, WinCollect version 7.3.1 P3 will only work with QR 7.5.0 UP8 and above.