hi julien im having same problem as you does your installation stop around 73% on step 2 before it saying application still in use?
hi julien im sorry your having this problem i may have a solution for you to update your adobe flash player i have you tried clear your system cache ,cookies ect because i believe this is your problem because these junk stuff taking too much memory and its not enough to finish the installment i would recommend you try advanced system care to clean your system
hope this helps
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It contains a utility that might assist you.