Installing Change Resolution Script:
copy "Change Resolution.jsxbin" file in Script Directory.

Example: Program Files\Adobe\Adobe After Effects ****\Support Files\Scripts 

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To use, run the script in After Effects: File > Script > Change Resolution.jsxbin
- In the project panel, select all folders that belong to the Handy Seamless Transitions
- In the script, set the required resolution for your project and click "Change"