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The current plugin version is designed to work with TeamCity 5.0 x and TeamCity 4.5.x (there are two plugin configurations).
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Directly from public TeamCity server:
5.0 x last nightly build
4.5.x last nightly build
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Sources in JetBrains Subversion repository.
Builds for TeamCity 5.0x and
Builds for TeamCity 4.5.x at JetBrains public TeamCity
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