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CCS/CC2640: Where to download the BLE Software Stack (SDK) 2.1.0 ?

Part Number: CC2640
Other Parts Discussed in Thread: BLE-STACK

Tool/software: Code Composer Studio

In the TI official guide 《Cc2640 Adding a UART or SPI driver to a Sample Project》,  BLE Software Stack (SDK) 2.1.0 is used ,as shown in picture  1. 

But only BLE Software Stack (SDK) V2.2.2 and  V1.4.2 can be downloaded , as shown in picture 2 .  Where to download the  BLE Software Stack (SDK) 2.1.0 ?

1.TI official guide 《Cc2640 Adding a UART or SPI driver to a Sample Project》can be got here:

2.BLE Software Stack (SDK) V2.2.2 and  V1.4.2 can be downloaded  here :