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Adding more products will require you to be an advanced user of After Effects. The video tutorial included does not cover this.
It will require some manual work at your end, since you must deactivate some expressions etc.
If you want less products, however, you only need to do some simple editing within the output-comps (disable one product and increase the length of the others)
This should be simple, as there are very few keyframes.

Specs:

• 16:9 3840×2160 (youtube, vimeo etc.)
• 9:16 1080×1920 (insta stories, snapchat ads)
• 1:1 1080×1080 (for facebook/insta-posts/ads)
• 4:5 1080×1350 (for insta-posts/ads)
• 3-product versions
• 4-product versions
• 10, 15, 20, 25 and 30 sec versions of all formats
• Simple color/effect controls (change the color of every element with ease)
• Easy placing of product images
• Easy text-insertion
• Dummy-pictures included
• Add image/video backgrounds with ease
• Video tutorial included

To avoid font-problems (since there are a lot of masks etc.) I recommend using the font I used upon creation of the template:
Open Sans

Music: Fashion-house-lounge