İnstall glade

Forgot:
to access the values in Gcode (eg the value 9.2 above) you can use:
Important notice:
I strongly recommend to use a quebuster command like 'M66 E0 L0' right before reading a hal pin in Gcode otherwise the readahead may read the pin much before code execution gets to that line.

Thank you very much

With 2.9 I have problem to open glade files done in 2.8.4 version, they request 3.8 while 3.4 glade is available. 
In synaptic manager gladevcp is not available. 

thanks for any help

Usually you can simply click 'OK' and save the file.

OK thanks if this is the solution. However it changes the layout of elements during opening, I will have to arrange them again. 
I thought the gladevcp of 2.8.4 is better and is available in 2.9.
 

What should I do to ensure that the values ​​I write are not lost and persist when Linuxcnc is turned off and on?