Cannot install Leo.CleanUpTasks.sdlplugin

I'm having problems to install the plug-in Leo.CleanUpTasks.sdlplugin in Studio 2017 (latest update), running in a VMware virtual machine with Windows 8.1, 64-bit.

When I get to the step where I should select the Studio version, the corresponding checkbox is greyed out:

 

How can I fix this?