Some of the following tips may help you get rid of the error 0x8007012A.
It is worth trying!
1.Check your Internet connection.

Keep connected to the power supply.
Remove all your connected external peripherals.
- kickstart your PC.
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Then if you are still stuck in trouble, you’re able to proceed to the next part.
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Step 2: ClickAdditional troubleshootersand chooseWindows Update > trigger the troubleshooter.
What should you do if you meet the Windows Update troubleshooter stuck on resolving problems issue?

This post will help resolving the issue.
BITS and Windows Update service are important to make the update downloading work well.
Step 1: TypeServicesinSearchand open it.

Step 2: Scroll down to locateBackground Intelligent Transfer Serviceand right-choose it to chooseStart.
Then repeat the last step to enable theWindows Updateservice to start running.
Now, you could test whether the install error 0x8007012A has been removed.
Step 1: TypeCommand PromptinSearchand chooseRun as administrator.
Step 2: Typesfc /scannowand pressEnterto execute the command.
If this command fails to repair the corruption, hey continue with the command DISM /Online /Cleanup-Image /RestoreHealth.
Step 1: Go toSettings > Update & Security > Windows Update > View update history.
Step 2: Remember the KB number you want to download and go toMicrosoft Update Catalogto search for that.
Then it’s possible for you to follow the on-screen guide to download and install it.
Fix 5: Reset Your PC
The last method to fix 0x8007012A is to reset your Windows.
Step 1: OpenSettingsby pressingWin + Iand clickUpdate & Security.
Step 2: ClickRecoveryand chooseGet startedunderReset this PC.
Bottom Line:
This post can help you sort out the install error 0x8007012A.
Hope this article can resolve your concerns.