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I have a problem installing TeamViewer 12 on windows 10, I tried many ways but still got same problem.  ???
I'm willing to give 0.005 BTC who will help me solve this problem.

Delete it completely and reinstall from link: https://www.teamviewer.com/hr/?pid=google.tv.teamviewer_exact_tv12.s.int&gclid=CNzxmvG_iNICFQ5mGwodPpMA7w.

Choose Personal (Non-commercial use).

When you don't use your any software for a while they become corrupt even you don't make any changes to them!

It's just because of some temporary file coming from the internet that corrupts the software!

You have to completely uninstall the software from Uninstalling a program utility in Control Panel,

After that go to your Program Files x86 folder and search for "TeamViewer" folder and remove it. Reboot your PC.

Now again download fresh updated version of TeamViewer and install it, again reboot your system and try it!

When you don't use your any software for a while they become corrupt even you don't make any changes to them!
You have to completely uninstall the software from Uninstalling a program utility in Control Panel,
After that go to your Program Files x86 folder and search for "TeamViewer" folder and remove it. Reboot your PC.
Now again download fresh updated version of TeamViewer and install it, again reboot your system and try it!
Hope it works! :)

source: http://www.techyv.com/questions/teamviewer-critical-error-verification-failed/

Address : 1E12rxHZd6dMJ8p6Bi2mVE6gU5q3urNXfN

try to install ofline   ??? ???

First option on this is turn off your windows firewall and download the latest teamviewer that compatible to your OS.
The second option that I find in the net is:

Just go in the programmpath of teamviewer

as example c:\program files\teamviewer\

- right click on teamviewer.exe
- registercard "digital signatures"
- mark the signature and click on "details"
- click on "show certficates"
- click on "install certificate"

Maybe you must update your microsoft net framework to the newest one. I already encounter that before when i trued to install some apps, but when i updated my net framework , it solves my problem .try it.

Download teamviewer from filehippo softwares, than install it from there. and check. hope it will work this time. filehippo will provide offline installers of original softwares.

TEAMVIEWER RENOVATION, REPAIR ERROR CAN NOT BE UPGRADED VERSION OF NEW TEAMVIEWER

Step 1: Uninstall version of TeamViewer is available on the computer
(You download the latest version of the software here:http://betdownload.com/teamviewer-33-download)
Step 2: Click the Start menu (bottom left of the screen) -> type Regedit in the Search Keyword Program and Files -> select Regedit in Programs
Step 3: Choose the HKEY_CURRENT_USER -> Software -> Remove items TeamViewer
And at HKEY_LOCAL_MACHINE -> Software -> you also find and delete items TeamViewer (if any).
TeamViewer

 
Step 4: Reinstall TeamViewer, however, do not rush this step due to the error message may still appear.

Step 5: Open the Run -> type the command services.msc -> OK

Search inscription TeamViewer -> Right click and select Properties

In the Properties window of TeamViewer select Startup type to Automatic and click OK to save the settings

So you've successfully overcome errors can not install the new version of TeamViewer replace the old version. Install version of TeamViewer for remote desktop support easy with useful features that utilities
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If u still get this error message, U can use UltraViewer. The UI is the same as TeamViewer and of course it's 100% free

Try to download it from the official site, probably you download it from other source

I think you are install it not from your computer administrator, try "run as administrator" option and always download the software from official site