Installed 9.0.4 but version of executable is 8.0.8?

[MaxHeadRoom]

BTW, Is it only required to save the Kicad-Pro file, or must the related SCH and PCB files be saved separately?

[tama]

To solve what is written here,

@MaxHeadRoom

I am running the latest (9.04).version and I am getting this message. when trying to open an older schematic file?

Error loading schematic. : Kicad was unable to open the file because it was created with a more recent version than the one you are running.
When I look at the version under error, it shows Kicak 8.08?
I thought that previous versions were removed or overwritten?

1. Check the version of the program the user is currently running

KiCad menu (“help” → “Abort KiCad”)

2. Visually see the version of the program that the user last edited

Visually check the KiCad version information written at the beginning of the file in a text editor.

If check at least these two points, you can be confident that your first question is correct. Because this question is often based on guesswork, it’s best to double-check and disclose the information.

[tama]

@Mineotopia

This is very confusin

I recommend not using the File Explorer that comes with Windows.

[MaxHeadRoom]

OK I have used WIN Settings to verify that evidently I still have ver 8 as well as ver 9 installed, so I am going to save all files and delete the ver 8 in Settings. ??

[paulvdh]

You can even delete the hole settings directory. You will loose some personal preferences, but if KiCad does not see the settings directory, it just creates a new settings directory with default settings. You can also use this to see if you inadvertently started a KiCad V8 version, as the settings for V8 are only created by a V8 KiCad.

[tama]

Is it only required to save the Kicad-Pro file, or must the related SCH and PCB files be saved separately?

Open each file in a text editor and you’ll find the answer to that question.

The warning pop-up dialog box is displayed by looking at the contents of the text file written in S-Expression Format as generator_version.

ps.
Different versions can coexist on Windows as long as the installation folders are different.
However, the generated files are upward compatible, but not downward compatible.
ex. pcbnew History of enhancements pcbnew/pcb_io/kicad_sexpr/pcb_io_kicad_sexpr.h · master · KiCad / KiCad Source Code / kicad · GitLab

[MaxHeadRoom]

OK I have removed the Kicad ver 8 completely and everything appears OK, except I seem to have lost a few previous files during my previous attempts?!

[paulvdh]

What sort of files?

KiCad does not concern itself with your projects during install or removal of the binaries. Default libraries may get deleted (so you should never modify them, or at least have backups). You may have lost links to your own libraries, but then just the links are missing, and your own libraries are still on your SSD / HDD somewhere.