You can use Notepad ++ (link to download) to open and view the
CitizenFX.log file. Then just copy and paste the contents inside to a website like Pastebin. Or you can simply upload the file here on the forums! Either works.
Also, the client folder is where you got your
CitizenFX.log file. Found here:
Did you make sure the delete all the files when you uninstalled FiveM?