Cannot move my trados studio to a new machine

Question

So far I was using Studio 2017. I have also purchased studio 2019 and studio 2021, but have never installed them because 2017 was fine. 
 
 Now I am trying to move to a new machine. 
 
 I am unable to deactivate Studio 2017 offline. It says it cannot connect to the activation server. 
 
 I tried to deactivate offline. I genereated the code. but Studio 2017 says the code is invalid. 
 
 I read that in order to upgrade from 2017 and activate studio 2021 on a new machine I have to install studio 2019 on the old machine and then deactivate it. 
 
 I installed my purchased studio 2019 on the old machine but it asks the activation code. I am unable to see it anywhere. I have paid dear for the software, but the code is nowhere to be seen. When I log in to my sdl account and pick Licenses and subscriptions I can only see entries for 2017, nothing for 2019. The code is also not visible in the downloads section. 
 
 Pleaase help me, I am stuck. 
 
 Kind regards, 
 witold

Elisa Maxim · Answer

Hi Witold Hrycyk 
 You upgraded your Trados 2017 license to Trados 2019. Trados 2019 is activated on two devices, as you can see in the Licenses section of your account https://oos.sdl.com/asp/products/ssl/account/mylicenses/licenses.aspx This is why you cannot activate a third time. 
 Please note upgrades are different from having separate licenses. Trados 2017 will work as long as it is installed on the same PC as Trados 2019. But if you want to upgrade to Trados 2021 (The option is available on the same Licenses page, see link above), you won't have access to Trados 2017 anymore. Trados 2019 can work as long as it is installed on the same PC as Trados 2021. 
 Please let me know which version(s) you want to actually use. 
 Kind regards,

Trados Portfolio > 2. Licensing and Installation

Cannot move my trados studio to a new machine