Trados versions greyed out and unselectable when trying to install the DeepL plug-in

I want to install the DeepL plug-in for my Trados version 2017, but am required by the installation Wizard to select the appropriate Trados version from the 2 Trados versions installed on my computer.  However, both these versions are greyed out and cannot be selected.  I therefore cannot proceed.  I would be grateful for any help ASAP.