# Cannot install latest Preview on macOS

**URL:** https://discourse.slicer.org/t/cannot-install-latest-preview-on-macos/8879
**Category:** Support
**Created:** [October 23, 2019, 5:22pm UTC](https://discourse.slicer.org/t/cannot-install-latest-preview-on-macos/8879 "2019-10-23T17:22:29Z")
**Posts on this page:** 5
**Page:** 1

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### Author: ![Fernando](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/fernando/32/5640_2.png) [@Fernando](https://discourse.slicer.org/u/Fernando)
#### Post date: [October 23, 2019, 5:22pm UTC](https://discourse.slicer.org/t/cannot-install-latest-preview-on-macos/8879/1 "2019-10-23T17:22:29Z")

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Hi all,

I get this on Finder:

 ![09](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/0/a/0a2e4708291b59793d627e60fd681ad214ef40fb.png)

And this within the error lines of `brew`:

```auto
 (miniconda3)  ~/git  brew cask reinstall slicer-nightly  ✓  62% (1:38) 🔋  3.49 Dur  17:40:53
==> Satisfying dependencies
==> Downloading https://download.slicer.org/bitstream/1123751
==> Downloading from http://slicer.kitware.com/midas3/download?bitstream=1123751
######################################################################## 100.0%
==> No SHA-256 checksum defined for Cask 'slicer-nightly', skipping verification.
==> Uninstalling Cask slicer-nightly
==> Purging files for version latest of Cask slicer-nightly
==> Installing Cask slicer-nightly
hdiutil: attach failed - no mountable file systems
==> Purging files for version latest of Cask slicer-nightly
Error: Failure while executing; `hdiutil attach -plist -nobrowse -readonly -noidme -mountrandom /var/folders/rp/779zzrds13q7z93s151_mv440000gn/T/d20191023-73477-prsgh9 /var/folders/rp/779zzrds13q7z93s151_mv440000gn/T/d20191023-73477-prsgh9/cfd4a367e042671e5575fac3c657ab36d5aafb8af133df11bef20a4b9e9459c3--Slicer-4.11.0-2019-10-21-macosx-amd64.cdr` exited with 1. Here's the output:
hdiutil: attach failed - no mountable file systems

```

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<div class="post-metadata">

### Author: ![pieper](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pieper/32/8_2.png) [@pieper](https://discourse.slicer.org/u/pieper)
#### Post date: [October 23, 2019, 5:37pm UTC](https://discourse.slicer.org/t/cannot-install-latest-preview-on-macos/8879/2 "2019-10-23T17:37:30Z")

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I can confirm I get the same dialog when trying to open today’s preview from [download.slicer.org](http://download.slicer.org).

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### Author: ![Sam\_Horvath](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/sam_horvath/32/3092_2.png) [@Sam\_Horvath](https://discourse.slicer.org/u/Sam_Horvath)
#### Post date: [October 23, 2019, 5:38pm UTC](https://discourse.slicer.org/t/cannot-install-latest-preview-on-macos/8879/3 "2019-10-23T17:38:37Z")

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Hi Fernando:

This appears to be caused by an upload error on the Midas server. See: [http://slicer.cdash.org/viewBuildError.php?buildid=1728377](http://slicer.cdash.org/viewBuildError.php?buildid=1728377)  
I frequently see this error (i.e. upload failed), but it is generally a false positive, and the package is uploaded and functional. No idea why it corrupted the file this time. Anyway, i have grabbed the package off the build factory and posted it here: [https://data.kitware.com/#item/5db08f85e3566bda4b0a88c5](https://data.kitware.com/#item/5db08f85e3566bda4b0a88c5)

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### Author: ![Fernando](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/fernando/32/5640_2.png) [@Fernando](https://discourse.slicer.org/u/Fernando)
#### Post date: [October 24, 2019, 10:59am UTC](https://discourse.slicer.org/t/cannot-install-latest-preview-on-macos/8879/4 "2019-10-24T10:59:48Z")

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Thanks @Sam_Horvath!

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### Author: ![Fernando](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/fernando/32/5640_2.png) [@Fernando](https://discourse.slicer.org/u/Fernando)
#### Post date: [October 25, 2019, 9:30am UTC](https://discourse.slicer.org/t/cannot-install-latest-preview-on-macos/8879/5 "2019-10-25T09:30:57Z")

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Today’s preview works fine.