Hi Jiri,
There still have issue, kindly help you to check what caused it, Thank you.
->I run IAR plugin manager (Menu "Help" -> "IAR Embedded Workbench plugin manager...") , can show the below info.

Note: I already installed IAR workbench in my laptop, the path is C:\Program Files (x86)\IAR Systems\Embedded Workbench 8.2\, the version is 8.32.3
-> after click the "Install" button into next step.

-> select all, and click the "Next" button:

-> click the "Next" button, problem is occurred, installation failed.

Phil Chen