You downloaded a "trial" pack. The creator has locked the transition until you purchase a license key. Remove the transition and find a truly royalty-free pack (look for "CC0" or "Public Domain" licenses).
“I need a whoosh,” Leo whispered. “A drip. A glitch .”
: In the properties menu, choose how the transition sits relative to the cut: : Centered on the cut. : Ends at the cut. : Starts at the cut. Apply to All Filmora 14