My Mac says I have 25GB of free space. The install options I choose requires 14.3GB.
Unity installer says that I have just 8.5GB free…
I tried to place the install files at another HD, but still gives me that error.
Probably requires more space for caches and temporary files.
Just free up some space. 25GB free is basically 0GB free in today’s standards.
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I don’t believe in that, must be some kind of bug with the installer.
The installer says I have 8GB free instead of the 25GB…
Maybe so! Free up some more space and see if it works, maybe file a bug report?
If it will install to 14.3GB it probably needs additional space to download components, decompress files, etc.
Disk space is cheap. Free some up or get a bigger disk. 1TB HDD’s are going for $34 on Amazon with free Prime shipping right now.
Same… I think its bug… Because Visual studio might atomatically installs on C:
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I have 406 GB free space, but i can’t install Unity 2019.1.a from Unity Hub (15 GB)
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Same with me, Unity hub seems bugged.
My windows system says I have 4GB MORE than I have free, and my Linux install says it has 3.6GB free (Not enough to install) when the system has atleast 25GB free. So it’s impossible to install Unity on there 
I’ve got similar problem here
the point is that my system and Unity Hub said that I had about 90gb of free space on my SSD where I tried to install it and then when I was trying to install Unity 2019(which needed only 11Gb of space) it dropped me message like “There’s not enough space to download and install selected item”. I attached screenshots also so you can check it.
Is that a bug? Am I doing something wrong?
P.S. I tried to reinstall Unity Hub and it didn’t help.
Had the same problem. Works fine if you just download it off of the Unity website instead.
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Unity Hub updates the free space only after a successful install. A workaround is, clear free space and do a bare necessity install. Then Unity Hub will update free space and one can install other components.
NONE of what anyone recommended has worked in the slightest. Unity is just plain broken and is now in meme territory thanks to this bug.
Ok… seems like complaning like a baby worked…neat.
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I have 1.20 TB free and that still pops up.
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If you are installing to another drive and not the main C drive then if there isn’t enough space for the temporary files on the C drive(Around 3GB atleast I think) it will say that try and free any space on the C drive like any unused files then try again once you have 3GB or more space free. I had the exact same problem and doing what I have said here instantly fixed it for me
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I had the same problem on Windows - it’s because Unity must be ran with Admin rights, but I work without it for security reasons. When I ran with Admin, all worked ok. But I don’t know, would it require Admin rights further.
That works for me, thanks.
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some problem with 100Go+ of free space.
I solved the problem by installing all modules except the Android one (with SDK+NDK).
I finally install the Android modules after that.
Restart Unity Hub…worked for me
My son also had an issue with the installer showing the wrong amount of free space on Linux.
I wrote a fake library as workaround and I’m providing it as “proof of concept” or “for educational purposes” - maybe it is useful for someone:
https://www.tuxad.com/blog/archives/2019/09/20/workaround_for_unity_installation_issue_not_enough_space/index.html