unable to delete 18+ GB file

I replied to the message in my inbox last night but apparently apple didn't like it as its not posted here so am sending the screenshot again - hope this helps reveal the issue - open application does not reveal the app - finder search does not reveal the app - delete app does nothing????

just heard from "Hidden Path completed its work on CS:GO in August 2012, and Valve took over Live operations at that time. You’ll want to communicate with Valve on any recommendations or concerns you have.

Not sure but will try to find Valve and see what they say - will keep y'all posted!

I was unable to find any info about how to contact valve - all links went to corporate as hiring but no developer contact info - so as a previous person stated download and install and then uninstall - so downloaded and installed and then I think I uninstalled but am not sure as it now shows up in the find all app but in getting info on it it only shows a few MBs instead of 18 GBs - if someone could tell me how to get the system info window that I previously posted a screen shot of so I can look at what's there now I would greatly appreciate that - I want to make sure it is not there as a remainder of the previous install - just can't figure out how I got that window open without it telling me I need to free up space?

haven't heard anything from the developer yet but think I got it - used the info re install and uninstall via steam and it is now gone from my steam library - I wasn't looking for system info but the window I posted pointed to my MBP applications folder - once I set the view options to what appears in the window I posted which is a system generated window for deletion of files taking up too much space - not sure how to get that window except thru the system when it thinks your out of space - anyway - I opened a finder window - selected the MBP then applications - view options similar to what is in that window and looked thru it for the SC: GO file and it does not appear in the window I am currently using - not sure if I run out of space again if it will be in the resulting window again but at least I have 75 or so gigs back now - thanks for everyones help - I hope its solved but cant be sure without seeing that exact window the system generated when I was out of space as in the capture posted above! If anyone knows how to see that exact set up other than what ive done with a finder window please let me know but am going to put it to bed for now - until I run out of space again - LoL

I downloaded and used the option key and still no files found?????

I don't know where it came from - it says never opened so I dont know the date or how long its been there - I can't get info on it so cannot find the source to download - reinstall then delete??????