If for some reason, a previous version of OSLC Connect for Jira needs to be installed, you only need to install it using the UPM (Universal Plugin Manager).

Before downgrading, please consider reporting any inconvenience or issue to a support representative; this to check whether an upgrade to an improved version is possible in the short term, or to confirm otherwise that the downgrade is the path to follow.

Not all releases of the OSLC Connect for Jira support a downgrade.
Given major changes made in some releases, a downgrade is not possible once installed.
Please refer to the New and Noteworthy section, of the version to downgrade, to find out whether it is supported.

Once downgraded, and if IBM Engineering Lifecycle Management global configurations or IBM Jazz Reporting Service / IBM Engineering Lifecycle Optimization - Engineering Insights (ENI) are being used by any Jira project administrator, advise the IBM Link Index Provider (LDX) and IBM Lifecycle Query Engine (LQE) administrators to verify the Jira datasources and to re-index in the case an error status was reported after the downgrade. This is a very important task in order to keep synchronizing those applications with Jira. On Reindexing an LDX/LQE datasource topic, LDX/LQE administrators can find a guide to do it.