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MDK539.EXE Keil PSN and License

Hi,

I have downloaded MDK539.EXE and installed, and tried to get the license from License management option of Keil ide menu. 

MDK539.EXE (935,160K)
Saturday, December 2, 2023 

While trying to complete the license activation from https://www.keil.com/license/install.htm

, i get this below error

The Product Serial # (PSN) may not be blank.

I have not received the PSN through email. I want to use Arm Compiler for Embedded FuSa 6.16.2

Please send the details on how to get the license and use the compiler in Keil uvision5 IDE.