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Using a downgraded compiler with a C51 Version 8 PSN

We're maintaining an old legacy project, The project was previously developed by an external supplier. The IDE development tool used is KEIL uvision 2.40(C51 V7.10), This is a very old version and we don't have PSN to install it. But we can install the C51V801 version using the PSN we currently have without any problems. We would like to be able to use a lower version of the compiler within the Uvision3 IDE(C51V801). We found this document and degraded using the compiler.

developer.arm.com/.../latest

However, the attachments provided here only support a downgrade to C51 V7.50, Can we get the C51 V7.10 downgrade attachment? Or can we extract the compiler from the C51V710 installation package by ourselves?

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