Questions about my computer after remote intervention from Adobe helpdesk

I am not sure if this is the right place to ask my question.

Yesterday I was in contact with the help desk people from Adobe for literaly 2.5 hours. The main problem was LightRoom 6 crashes, and it was decided very soon that I needed Lightroom 6.14.  I wasn't told why installing this had to take 2.5 hours. My computer (Mac) was taken over remotely for the whole time and there was no communication. 

Today I notice that I cannot empty my Trash, because of the message "The operation can't be completed because the item AndroidFileTransfer.dmg is in use". Ten minutes ago, on my previous attempt, the message was: "The operation can't be completed because the item AcrobatUpdateHelperLib.dylib is in use".

Anoter strange thing is that in Finder I can see that my structure looks different. It used to have the items Mac HD, External HD, Recovery HD, and Network.

Now, since my Adobe intervention from last night,  the items "Android File Transfer" and "Lightroom_6_LS11" have appeared. They look like external devices, as they have an "eject"-icon.

I am sorry if these are silly questions. I don't know anything about these things and have no one to ask it to. But I would like to know what these things mean, and how to get rid of them. Even though the help desk was working on my computer for 2.5 hours, there was no communication and I have no idea what was happening, and why.