java – Eclipse RCP plugin repository – old versions of plugins?

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I’m about to start modernization of a very old Eclipse RCP application, which uses Eclipse Helios (2011) as an IDE and runs on Java 1.6.

The first step I’d like to do is to take a newer version of Eclipse IDE and force it to load that ancient project. What I came across is the following problem: old plugin dependencies are present:

org.eclipse.ui (3.203.100.v20230417-1307)

but their minor versions have gone through a lot, too. What I need, for the example above, is:

org.eclipse.ui (3.6.2.M20110203-1100)

Is it really the case, that I can’t get core plugin versions in any version I desire, only in the one bundled with the IDE?

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