I had the same problem. First my project name was: " Substance DT - Physically Based Shading for Unity Using Substance Designer[Unity5]". I put it into a folder with the same name and I had those errors. I Think the problem is when your project name (or folder with your project) have specjal characters like [, ], chinese letters etc.
So you should just to create new project without special characters on the name:smile:.
I get this same error. I have tried with Unity 5.3.1p1, 5.3.1f1, 5.3.0, 5.2.4, and 5.2.1. Always the same error: "
Failed to import package with error: Couldn’t decompress package
UnityEditor.Web.JSProxyMgr:smile:oTasks()". I have installed Unity on my C Drive, My D drive, re-installed uFPS several times, made sure the folders all had full permissions and it still does not decompress. I find it strange that this is the ONLY package that presents this error; I have 48 other packages and not 1 of them gives an when trying to open it in Unity.
To say the least, I am starting to get very frustrated. For the asset creator to blame Unity for this error, I think, is very unprofessional. There is obviously something wrong with the way this asset was packaged.
Has anyone remotely found the reason for this error?
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Yeess I have the same opinion. And on the chat, they suggest to the plubkisher to compress the pack in a folder. But i dont know whath we can do like costumers.
Hey, i will try somethink like they suggest on thr top, I have make more place in my C:driver and retry. I’ll come back let you know if it’s work it.
Update: So I figured out my issue, sort of. The problem was, Windows 8 is somehow preventing the package from decompressing; maybe permissions. I asked a friend and he was using Windows 10 and could decompress the file. I tried on my Windows 7 machine and it was also successful.
To make a long story short, after messing around with permissions on the windows 8 machine, with no luck, I decided to upgrade to windows 10 and it worked right away.
If upgrading is an option for you maybe give it a try.
I also encounter this error: “Failed to import package with error: Couldn’t decompress package
UnityEditor.Web.JSProxyMgr:smile:oTasks()”. While importing the updated package of Unity Survival Shooter for Unity 5. I’m using Unity 5.2.0 (64-bit) OS: windows 8. I know @legasce said that win8 is somehow causing this problem, but why can I import other packages except the one I recently downloaded? I want to downgrade from win8 to windows 7 but that is a lot of work. Any solution?
great,I’am chinese, it’s my situation, thanks, no chinese routinue
ERROR FIXED.
There was not enough disc space to decompress, make some disc space and try.
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I had the same error, try deleting the file and redownloading it by going to %appdata% > unity > Assets Store > Unity Technologies and then the click the final folder then find your package and delete. go back into unity and press control + 9 (if your downloading from the assets store) find your package redownload and try decompress it again. if it doesn’t repeat the process, if it still doesn’t work it may be you dont have enough space or something else. hope this helped
The best option is to use Windows 10 or Windows 7, Windows 8.1 has a little problem when importing the package in some unitypackage files. So, try to upgrade to windows 10 or dual boot it.
I solved the problem by removing the files which unsuccessfully tried to upload the first time. By default, they are located in the folder C:\Users\NAME_OF_YOUR_PC_USER\AppData\Roaming\Unity\Asset Store-5.x\Unity Technologies\Unity EssentialsSample Projects
And then just download the asset again.
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I’ve got the same problem “Failed to importing package.Couldn’t decompress package” when importing vuforia 6.How could I solved this?
My Unity version : unity 5.4.0f3(64bits)
windows8.1
If your system does not have enough space, the decompression cannot be performed. Open some space and try again. It solved my problem.
Perfect for me. Thanks!
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In my case I had the problem because I unfortunately hit the cancel button during the first time this operation was to be performed. All the successive Import were failing. My solution was to go to “C:\Users\accountName\AppData\Roaming\Unity\Asset Store” [thanks to @arvzg_1 for the path], eliminate the package and start again from Unity Asset Store. Have a good day guys!
The way I fixed the problem was going to %appdata% > Roaming > Unity > Asset Store-5x > (Name of Author) and deleting the folder with the assets, and redownloading. Thanks everybody who was involved in this!
I am also getting the error of “Couldn’t decompress package” while importing it into unity 5.6 project. But when I tried to import the same package in unity 5.4 it worked. There must be some problem in reading of package file with unity 5.6. or is it the issue with the package file ? Let me know if anyone has all ready faced and how did you resolved it ?
Well I found the solution the for it for unity 5.6.0b8. It worked for me. Here is the step.
Note(you must have different version unity working for importing the same package)
- Go to “C:\Program Files\Unity 5.6.0b8\Editor\Data\Tools” and look for 3 files with name 7z. (7z.dll, 7z.exe, 7z.txt).
- Copy all the above listed file and make sure backup it your different folder.
- Now Go to “C:\Program Files\Unity\Editor\Data\Tools” and look for 3 files with name 7z. (7z.dll, 7z.exe, 7z.txt)
- Copy all above file and replace it with other files in “C:\Program Files\Unity 5.6.0b8\Editor\Data\Tools” and look for 3 files with name 7z. (7z.dll, 7z.exe, 7z.txt)."
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That was helpfully. Thanks.
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Thanks.
I think this issue might caused by the version of 7-zip that Unity used have some kind of bug.
Some supplement:
You can also download the old version of 7-zip {7-Zip 9.20 (2010-11-18) for Windows} form here http://www.7-zip.org/download.html
Then unzip the 7z.dll & 7z.exe files from the setup file.
Copy those two files and replace files in “C:\Program Files\Unity\Editor\Data\Tools” this folder.
Restart Unity.
Have fun!
ps. Crappy English, Sorry. 
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