It is compatible with 1.0.3

do note Bogdan worked very hard on a new whmcs module for the last 6 months or so, This is available in the downloads section, and will be updated in the whmcs market place and community plugin sections over the weekend.

Regards,

Marco

Thank you for your response.

So can I upgrade the WHMCS module to the new version (released in September 1st) for SolidCP 1.0.3 in production environment?

I ask about the compatibility because I have read in the readme file:

Update instruction:
Please note, that due to structure changes in the database, there is no possibility to use old modules (< 1.1.0) after a successful migration.

You should be able to, the modules it talks about is the WHMCS modules.

it will have a migration path for you if you used older SolidCP WHMCS Modules (as they no longer work the same)