you're welcome, but no, acrobat 7 cannot legally be used by non-licensed users for any length of time.
and while there are non-current adobe trial versions available back to certain versions, for acrobat, version 8 is the oldest trial version available. so, you can legally download and use (for 30 days) unlicensed acrobat versions, 8, 9, X and the current version XI.
the acrobat pro 7 that adobe is making available is only legal to use by licensed acrobat 7 owners. it is not legal to use for 30 days, or any other duration (limited or not), for non-licensed users.