Hi, I bought ightroom around a year ago and I updated my mac and somehow my is gone. There is a big question mark for where Lightroom should appear at the bottom. I searched for Lightroom on my computer and it doesn't show up. Is there anyway to look up I bought it and I can redownload it?
Not sure what 'updated my mac' means. If you mean you have a new computer then all your files etc should be in the new machine if you used the set up assistant on the mac to transfer your existing files and applications etc from the old mac to the new mac. You shouldn't need to redownload Lightroom.
If you can't find Lightroom, did you look in Finder? If not, go to finder (left hand icon in dock), click Applications, double click Adobe Photoshop Lightroom (listed alphabetically at 'A' at the top if you have list view) if you want Lightroom to open. If you just want the Lr icon back in the dock, simply drag Adobe Photoshop Lightroom from Finder down into the dock.