Error "Invalid class"

Question

Hello, 
 Whenever I try to open my Trados Studio 2017 installation on my Windows 11 laptop, the error message "Invalid class" appears and Trados won't open. 
 I tried the workarounds #1, #2 and #3 from this webpage: https://gateway.rws.com/csm?sys_kb_id=b24f61e983466690396947426daad39d&id=kb_article_view . But without any success. I cannot do workaround #4 (SDL Freshstart app) as this apparently cannot be used for Trados Studio 2017. 
 The problem exists since mid-December. I wonder if it was caused by an update (Windows, Trados, etc.). 
 I would appreciate any advice. Thank you!

Elisa Maxim · Accepted Answer

Birgit Althof We will be pleased to help you with this problem so have logged a support case on your behalf. We do prioritise customers who have a support contract so please keep in mind it could take up to 48 hours, especially over a weekend, but rest assured we will contact you as soon as we can. You will be contacted at the email address used for this Community. Support Case Id : CS0037055.

Elisa Maxim · Answer

Hi Birgit Althof 
 If you have Windows 11 try the following steps: 
 In Windows search bar type "Device Manager" and open it and then go to: Network Adapters - Action - Add Legacy Hardware - Install the hardware that I manually select from a list - Network adapters - Choose a network adapter (Microsoft > Microsoft KM -Test). 
 Kind regards,

Trados Portfolio > 2. Licensing and Installation

Error "Invalid class"

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