You may try instantClient. However it would be better answered by Oracle also it give the disk space while installing so can choose minimum one. Also may try multiple package one by one and may easily uninstall if found unusable.
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Service Manager requires 32 bit Oracle Client library, which can be found in the Oracle 64 bit Client installation directory or Oracle 32 bit Instant Client directory. Please refer to the Oracle site to download the proper Oracle client for the platform where you plan to run Service Manager server.
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