I remember a feature at vbhackers (modifications site) that was only implemented in the resources area where you had to click installed before you could download and I didn't agree with it then because sometimes a person would download to view rather than installing it. I think this resembles that feature alot and the person may just want to view that resource/attachment rather than actually permanently use it.
I feel this is too restrictive in the way of an extra click needed. I feel being a customer is enough without having to force (in this case) like a thread before you can download.
To add to that. I feel the like should be clicked willingly not forced upon any member.