Hi @atesfet and welcome to neurostars!
This looks like a duplicate of two recent issues (FSL download stuck at 100% - #19 by Sam_Min and Problems installing FSL - #11 by Joan_Carreras_Diaz). Having too many threads open about a single issue makes it confusing and more difficult for users to find answers. So I am going to close and unlist this thread. Please follow up on your issue in already-created posts.
Best,
Steven