[Bug] [Launcher] Wrong free space calculation

Good day,
My OS is Windows 10. It updates regularly and is up-to-date.
Epic Launcher’s version is


Two bug cases:

Adding modules

Let’s say you have successfully installed UE4 and want to add some components to it. Say, I want to add engine source code which requires less than 100 Mb or add a cooking module, like HTML5. So I open launcher, then go to Vault, press an Engine version’s dropdown and select Settings. Then I add HTML5:

I have 3.5 Gb of free space right now on my SSD. The downloaded and unpacked content is about 0.7. Nothing should stop us :smiley: But, Bam! Error: Not enough free space on C:\Program Files (x86)\Epic games\4.13

So I need 9.35 GB of free space on my disc to install 535 MB of needed content (_ _)

Resuming UE4 download

Just a day before I had about 20 GB of free space and decided to try out upcoming 4.14 version. It successfully launched download process and showed me a BSOD at about 60-70% of download.
(This is going to be a regular practice, a very bad practice! I had BSOD 4 times, each while downloading a particular version of UE. My OS is stable and these are the only cases I meet BSOD)

At this point UE ate a significant amount of space on my SSD and launcher is capable of resuming its download. I click ‘continue’, and… bam! Not enough free space! “Hey, but it was quite enough just an hour before!”.

So now I need to delete an uncompleted version to try installing it again while hoping that no BSODs will pop out tis time (_ _).

UE4 is around 14GB in total, each time it needs to update, reinstall, or add a feature, it needs to make sure that you have enough disk space for the entire engine, even if you are trying to add a small feature.

Waht you can temporary do is move some stuff to a USB drive or your secondary hard drive, then install the feature, then move them back

Hey CosmoGorynych,

We have recently modified the process for how Epic Games can help troubleshoot your Launcher issue. Please visit http://help.epicgames.com/ for technical support, here you can find information and solutions for common issues, as well as a contact form if you still need additional assistance. To access the contact form, please use the “Email Us” button under the “Contact Us” section.

Have a great day