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After reading articles about the state of Truecrypt in February 2015, I decided to download the last stable version of Truecrypt that allows full usage of Truecrypt: that is, version 7.1a

7.2 version that can only be used to view, but no longer to create new, TrueCrypt volumes.

see https://www.grc.com/misc/truecrypt/truecrypt.htm

I then proceeded to install this on my Mac, running on Yosemite 10.10

But I got the error message "truecrypt 7.1a requires Mac OS X 10.4 or later", see below.

truecrypt 7.1a requires Mac OS X 10.4 or later on Yosemite 10.10

I guess it's simply a schoolboy error from a developer of the Truecrypt team, as it considers 10.4 being above 10.10, or maybe it's rather Apple who messed up & should have consistantly used 2 digits after the dot (i.e. use 10.04 rather than 10.4).

In any case, I find myself unable to install Truecrypt. Anyone found a solution for this?

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3 Answers 3

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  1. Copy the mpkg from inside the downloaded disk image onto your Desktop.
  2. Right click the mpkg file and choose Show Package Contents, then open the Contents folder.
  3. Open distribution.dist with a text editor.

  4. Remove lines 13 to 18.

  5. Save the file and open the mpkg normally.

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  • 1
    Found the exact same guidelines on lazymind.me/2014/10/install-truecrypt-on-mac-osx-yosemite-10-10
    – Adriano
    Commented Feb 21, 2015 at 12:49
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    Note that one has to move the mpkg off the mounted dmg otherwise file is read-only.
    – pdeschen
    Commented May 7, 2015 at 1:09
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    great answer! - what a sad bug though that the OS version is compared as string, so 10.10 < 10.4 :-(
    – ssc
    Commented Oct 16, 2015 at 10:17
  • Ugh, now in Catalina, looks it won't open at all because of the discontinued support for 32-bit applications.
    – Nathan Beach
    Commented Jul 19, 2020 at 20:25
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  • Open Terminal and enter
    sudo nano /System/Library/CoreServices/SystemVersion.plist
    and enter your admin password.
  • Change the two strings "10.10" to "10.9". Leave the minor version number (e.g. 0, 1, 2...) like it is. Hit ctrlO and Enter to write the file to disk.
  • Hit ctrlX to quit nano
  • Leave open the Terminal window.
  • Install TrueCrypt 7.1a
  • after the installation is finished change to Terminal and enter
    sudo nano /System/Library/CoreServices/SystemVersion.plist again
  • Change the two strings "10.9" back to "10.10". Hit ctrlO and Enter to write the file to disk.
  • Hit ctrlX to quit nano
  • enter cat /System/Library/CoreServices/SystemVersion.plist to recheck the correct system version (e.g. 10.10.2 or whatever it was).
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  • 8
    Does the job I suppose. But I'd rather change the install script of truecrypt rather than touch the OS config files.
    – Adriano
    Commented Feb 21, 2015 at 13:49
  • @AdrienBe That's true...probably it's a bit faster but more dangerous
    – klanomath
    Commented Feb 21, 2015 at 13:51
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    Please do not offer solutions that tamper with system files and affect whole system rather than the application involved in the question.
    – HMage
    Commented Apr 5, 2015 at 16:12
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    @EugeneBujak Your point has merit, but please make it about what you are comfortable and not about telling someone what not to write here. I learn a lot from the answers (even unsafe ones or ones you shouldn't do without a backup net) that stray from what's trivially undoable.
    – bmike ♦
    Commented Apr 11, 2015 at 0:19
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At step 4. why not simply correct the bug line 13 as :

    if(!(system.version.ProductVersion >= '10.04.0' )) {

etc.

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  • 1
    Because this isn't any more ‘correct’, '10.3' >= '10.04.0' is true but that clearly shouldn't be. The logic condition needs to be more advanced to test the product version correctly.
    – grg ♦
    Commented Jun 4, 2018 at 10:10

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