I cannot open diagrams saved in 6.2.2 in newer version 6.3.1

when I try to import proc file is cannot open it because if some inconsistency

can you help?

What you should try to import is the .bos file generated from the export of Bonita Studio version 6.2.2, not the .proc.

If you already try that and it failed, can you share the full Studio log file and your .bos file export from Bonita Studio 6.2.2?
Studio log file is located in BonitaBPMCommunity-6.3.7/workspace/.metadata and file is named .log (note that folder and file might be hidden). Log file is also available in Studio menu Help → Bonita BPM Studio log.

thanks for reply

I tried and made export into .bos file

but the 6.3.1 version when I click on import file > Bonita > it offers only .proc or .bar formats

I did a test on 6.3.1 and when I go to “Import” I get the following popup that let me import a .bos file from Bonita v6 export:
Import screenshot

Can you double check the version of Bonita Studio you are trying to import to?

I see it differently
I have just
Bonita
BPMN
XPDL
jBPM

maybe I see now that I have BonitaBPMCommunity-6.3.1 but I am opening that with Bonita Open solution 5.10.2

maybe that is the problem

If you have an import screen that look like that:
Import v5

You are definitively running Bonita version 5.x