This is a specific scenario in which the client package has been installed as administrator and as normal user. Parallel installations of the client should not exist, to avoid conflicts with files used by both installations like the uninstaller (C:\ProgramData\NoMachine\var\uninstall.exe). This parallel installations should be instead blocked.

The client installation as administrator is in C:\ProgramData\NoMachine, while the installation as normal user is in C:\Users\<username>.
For example:
C:\Program Files\NoMachine Player
C:\Users\nxuser\NoMachine Enterprise Client

In this example, when you uninstall NoMachine Player, you cannot then uninstall the Enterprise Client, because Player removes C:\ProgramData\NoMachine

Note that this problem can happen with Enterprise Client packages and Player packages as well and it's not related to the renaming of the client package.