“This copy of the Install OS X Mavericks application can’t be verified. It may have been corrupted or tampered with during downloading”
The reason why this insane message is happening is because as of February 2016, the security certificates that validate these Mac OS X installs seems to have expired. What this means is that when you try to install Mac OS X Mavericks, Yosemite or El Capitan from any USB or external source, the certificate checking process will render your copy of the installer null and void. You will then get the error “This copy of the Install OS X Mavericks application can’t be verified. It may have been corrupted or tampered with during downloading.”
Thankfully, as annoying as this is, there’s a pretty easy fix in the Terminal, located on every installer of Mac OS X. Here’s what to do:
Boot into the OS X installer as you would normally do (hold down option at boot and choose your installer
Disconnect the ethernet cable if it’s connected and turn off wi-fi from the networking menu
Open the utilities menu item and choose “Terminal”
When the Terminal appears, simply type in the following command: date 0202020216
Hit return and you will now see the new date as read back by the system
Quit the Terminal
You can now begin to reinstall OS X from the main screen as you did before
Why does this work in the Mac OS X Terminal?
The reason why this works is that you are actually turning your computer into a time machine–and you are telling it to go back to the date February 2nd, 2016. This tricks the certificate into believing that the date is now in the past and allows the installation to resume. You can also redownload any installers to get the new certificates, which are located in your purchase history on the Mac App Store. You would then have to make new installer disks with these new downloaded installers.
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Apple really seems to be serious in killing your trusty old iPhoto software with the recent Mac OS X updates including Mavericks and El Capitan. The end result is that Apple clearly wants you to use their new Photos app, which is a direct copy of the Photos app on the iPad and iPhone. The problem is, however, a majority of users still would like to use iPhoto and not have to be forced to this new Photos app (myself included). So, what do you do when you install El Capitan and iPhoto no longer works? It’s not an easy answer(s), but, here’s some tips below to see if you can get iPhoto running again.
The best advice we have seen is to simply do an app store downgrade of the iPhoto, which actually worked for us. Here’s what you want to try first:
Go to the Apple Menu –> App Store
Head to the Purchases tab and sign in with your AppleID if you haven’t done so
See if iPhoto is in this list of previous purchases
If iPhoto is in the list, you may download it from here, by clicking on the install button
It may give you a warning about iPhoto being an earlier version–proceed to download anyway
Make sure all other users on your computer are logged out and not running iPhoto
This is a large download (a little over a gigabyte) so it’s going to take some time
It may ask that you update your iPhoto library to work with this version, which you would want to do
If iPhoto detects problems with your library, it will ask to repair it, which is also OK to perform
If all went well, you should have a previous version of iPhoto on your computer at this time, which hopefully will work with the newer Mac OS X versions. If you did not see iPhoto in purchases, here’s another tip that users have tried first:
Before doing any of the steps above, you have to create another User account with full administrator privileges in the Users and Groups area of your System Preferences. Restart your computer after creating this account and then log in to the App Store (just like above steps), head to Purchases and click the iPhoto button which now hopefully says “Install” and not “Upload”. If this works, you can then restart and go back to your original user account and now delete this temporary account you created in Users and Groups.
If iPhoto seems to keep showing you the “Welcome to iPhoto” splash screen after every restart, a simple solution seems to be to delete this preferences file:
com.apple.iPhoto.plist file from your HD/Users/ *your username here* / library/preferences folder
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I’m sure a lot of people noticed how your power button behavior in Mavericks 10.9 changed quite dramatically. Here’s how it changed:
“Press the button once, and it puts your display to sleep. Press and hold it for a second or two, and the Shutdown / Restart / Sleep dialog appears. Press and hold it for even longer, and your Mac gets completely powered off.”
Previously to Mavericks, hitting your computer’s power button would bring up the nice dialog box asking you to sleep, shutdown, logout, etc. Mavericks killed that little gem and forced your computer to simply go to sleep when hitting the power button. I personally thought this should have been a choice for the user, not a given. I prefer the older behavior of showing the nice dialog box, so, here is a neat trick to get the older behavior back by launching your Terminal application and typing this into the window and rebooting your computer:
defaults write com.apple.loginwindow PowerButtonSleepsSystem -bool no
To reverse the behavior, simply type this in to the Terminal and reboot:
That’s an easy one! If you no longer can play music through the external Radiant Player, or, Google Music in your browser, you simply have to upgrade your version of Adobe Flash. Remember, Google Chrome has Flash built-in, so, you won’t see the issue there. However, if you use Safari, Firefox, or Radiant Player, you must upgrade your version of Flash, or, you will see a blocked plugin message. You can upgrade Adobe Flash by visiting this site. If you enjoyed this article and we have helped you out, please consider a small donation so that we may bring you more helpful tips and tricks on the Macintosh!