I had the same issue. Here is a workaround for that:
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Go to WIndow > Quixel Bridge
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Then go to:
local > metahumans (I´m assuming here that the Metahuman is already downloaded.)
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Select the metahuman you want to import. Click on the dots underneath the picture of your metahuman
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Click on Go to Files (your explorer will open)
- Open up your content browser and search for the metahuman folder
- right click the folder and select “Show in Explorer”
- close Unreal Editor
- Go to explorer
- Move ALL the files from the directory of the metahuman that you want to import into the metahuman directory.
- while you copy the data there will be prompt! The destination has X files with the same names
- select skip these files
- Open up Unreal Engine again.
Your Metahuman should now be imported.
Hope this helps 