All CrazyTalk Animator contents are compatible with CrazyTalk Animator 3. There are two methods available and we recommend Method #1.

Method #1: -
The easiest way to bring in all your previous version CrazyTalk Animator content is to simply reinstall all your content packs (via Universal Installer) as this will directly add them into your CrazyTalk Animator 3 folders.
During content packs installation, simply check CrazyTalk Animator 3 for specified version.

Method #2: -
1) Manually copy all content from CrazyTalk Animator previous version to CrazyTalk Animator 3's corresponding location. Please DO NOT replace the files with the same name in order to avoid any version mismatch.

Folder reference: -
Windows
CTA1 Template folder: (Vista/Win7/Win8/Win10)
C:\Users\Public\Documents\Reallusion\Template\CrazyTalk Animator Template

CTA1 Template folder: (WinXP)
C:\Documents and Settings\All Users\Documents\Reallusion\Template\CrazyTalk Animator Template

CTA2 Template folder: (Vista/Win7/Win8/Win10)
C:\Users\Public\Documents\Reallusion\Template\CrazyTalk Animator 2 Template

CTA2 Template folder: (WinXP)
C:\Documents and Settings\All Users\Documents\Reallusion\Template\CrazyTalk Animator 2 Template

CTA3 Template folder: (Win7/Win8/Win10)
C:\Users\Public\Documents\Reallusion\Template\CrazyTalk Animator 3 Template

Mac
Users/Shared/Reallusion/Template/CrazyTalk Animator 3 Template

2) Since these digitally protected content were not installed using their original installers, nor downloaded from the BackStage, then they need to be re-verified for use in CrazyTalk Animator 3.
Please go to main menu, "Help" -> "Content 1-Click Verification", this will help you verify all your templates and custom content in a single go.

After clicking "Content 1-Click Verification", a confirmation dialog will pop up. Read the information carefully and click on "OK" to begin the verification process.

Please note that the verification requires an internet connection.