Movavi offers a free trial for Slideshow Maker. While it won't let you export projects (or will watermark them), it's a good way to test the software.
Add your photos, videos, and music.
To activate , you must use a valid license key purchased from the official website or a trusted retailer. There is no legitimate "free" activation key that you can simply copy and paste , as these codes are unique to each purchase and linked to a specific user's email. Official Activation Guide