I Installed UE4 on an External HD which doesnt work anymore, I Tried Reinstalling into my Laptop but keep on
receiving "Invalid Drive: I:" Its confusing since I dont have a Drive:I before and I’ve searched everywhere for a solution
but found nothing to fix my problem mainly because im using windows 10 so most of the solutions wont work.
Hello Noohshab,
Are you attempting to do a clean reinstall of the launcher or are you simply trying to redownload the engine through an already installed launcher?
Clean Reinstall the Launcher, I tried Looking through the Registry I tried deleting all the remains of the program on my laptop still nothing 
Hello Noohshab,
If you had UE and the Epic launcher previously installed but the drive no longer exists, then the issue might be some old registry entries. Users on Win 10 have followed the steps here to help remedy issues due to corrupt or partial installs.
If this does not help, please reply back and we will continue to look into this for you.
Hello Noohshab,
We haven’t heard back from you in a few days, so we are marking this post as Resolved for tracking purposes. If you’re still experiencing this issue, please try the suggestion that I mentioned above then post back here with the requested info.