Quick Fix: How to Open a Motion Graphics Template in Adobe After Effects

First you need to make your pc Folder Options with 'Hide extension for known file types' from checked to unchecked box.

Steps:

1. Rename file with '.mogrt' to '.zip', 
2. Extract it, browse inside,
3. Look for file ending with '.aegraphic', 
4. Rename '.aegraphic' to '.zip' again, 
5. Extract it, browse inside, 
6. Look fo file with '.aep' extension, 
7. Open that '.aep' with Adobe After Effects. 
8. Edit! 

Or as I tried it with After Effects 2020,

• File > Open project, 
• Choose .mogrt file, 
• New window appears, click 'Extract', 
• Some words from After Effects appears, click OK, 
• Edit!

Easy!