Cloud connectors consist of these plugins.

A- Framework dependencies:
1- Core connector plugin version 1.2.3
https://confluence.atlassian.com/display/~rkrishna/Core+Connector+for+JIRA+1.2.3+for+JIRA+6.0-OD7

2- JIRA connector plugin version 1.2.3
https://confluence.atlassian.com/display/~rkrishna/JIRA+Connector+for+JIRA+1.2.3+for+JIRA+6.0-OD7

B- The Connectors plugins:
3- Connector for Salesforce and JIRA Version: 5.2.2.1
https://confluence.atlassian.com/display/~rkrishna/Connector+for+Salesforce+and+JIRA+Version%3A+5.2.2.1+for+JIRA+Version+6.0-OD7

4- Connector for Zendesk and JIRA 2.2.3
https://confluence.atlassian.com/display/~rkrishna/Connector+for+Zendesk+and+JIRA+2.2.3+for+JIRA+6.0-OD7

5- Connector for Get Satisfaction and JIRA 2.2.1
https://confluence.atlassian.com/display/~rkrishna/Connector+for+Get+Satisfaction+and+JIRA+2.2.1+for+JIRA+Version+6.0-OD7

6- Connector for uTest and JIRA 1.2.1
https://confluence.atlassian.com/display/~rkrishna/Connector+for+uTest+and+JIRA+1.2.1+for+JIRA+6.0-OD7

They need to be upgraded together, otherwise any currently deployed version will break.