Rasa sdk 2.3.1

Hello,

My client wants to migrate its rasa to a new server and i have to configure it. It doesn’t want to upgrade rasa, it works perfectly well as it is.

when i type rasa --version: Rasa SDK Version : 2.3.1 Rasa X Version : None Python Version : 3.6.9

I tried to install it throug pipe . pip3 install rasa_sdk==2.3.1 , it seems that version is not avialable anymore: i received the following error:; ERROR: Could not find a version that satisfies the requirement rasa_sdk==2.3.1 (from versions: 1.0.0rc3, 1.0.0rc4, 1.0.0, 1.1.0, 1.1.1, 1.2.0, 1.3.0a1, 1.3.0, 1.3.1, 1.3.2, 1.3.3, 1.4.0, 1.5.0, 1.5.1, 1.5.2, 1.6.0, 1.6.1, 1.7.0, 1.8.0, 1.8.1, 1.9.0, 1.10.0a1, 1.10.0, 1.10.1, 1.10.2, 1.10.3, 2.0.0a1, 2.0.0a2, 2.0.0a3, 2.0.0a4, 2.0.0a5, 2.0.0rc1, 3.0.0rc1, 3.0.0rc3, 3.0.0, 3.0.1, 3.0.2, 3.0.4, 3.0.5, 3.0.6, 3.0.7, 3.1.0, 3.1.1, 3.1.2, 3.1.3, 3.2.0, 3.2.1, 3.2.2, 3.3.0

Do you know where I could get it?

thx Olivier