Yes ... it totally sucks ... basically they offer you 'on premise' odoo option. But you have to go download the updated code manually ? Which is ...

Agree. Github access should be included. But I think it's made on purpose. Being a self learning developer in Odoo is very often frustrating when you want to have access to Enterprise. To work comfortably, You you need to pay 490-590Euro minimum for learning partnership (depending on the country), namely, just to have only access to github code. Then every 30th day need to paste your subscription code, to activate your enterpise dev odoo environment to work with.

Since few years I was asking Odoo guys, please introduce monthly subscription also for Partners. Will be more flexible. I don't need the access every month. So far - Nope, still nothing changed. Still only single payment. Regular partneship is costing few thousands Euro / year minimum. So, what is the problem to make monthly subscription here? We never will know that. We just need to pay, or cancel. Once a year. Hope this will change and improve some day. But with every next year I doubt it more and more.

Anyway, Greetings and Thanks Herve, for your clear explanation on this matter.

@Pedro, it is quite boring, I put the answer in this page. Please, read it, thanks !

Yes of course, it is available for all Odoo version at the same place in github. But to access to it you must be a partner or customer of Odoo, otherwize you get the "404" error

I am a customer, I bought licenses recently but when I enter that section it says that it is only for partners