Welcome to the forum.
Usually when you can't thicken a surface it means you have surfaces that have intersections that cannot mesh.
What exactly are you experiencing? What messages?
What version are you running. Can you post this file here in this thread?
If this solved your issue please mark this posting "Accept as Solution".
Or if you like something that was said and it was helpful, Kudos are appreciated. Thanks!!!!
Right click on the STEP file.
Select Send to Compressed (zipped) Folder.
Attach the resulting *.zip file here.
Read response #3. - you should be attaching a *.zip, not a *.stp
How large is the zipped file?
What browser are you using to view this forum?
I don't either.
Just save it to your local and then browse to where it is under the attachments portion at the bottom of the responding screen.
Explain what you have tried to get this surface model to a solid.
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