It should be available for PC.
Oh, try Photo Collage Maker. It’s the same thing but my tablet is weird. On some apps it will tell me it’s called one thing when it is actually called something different.
I hope that works for you! Sorry about that. If you have any more questions just let me know!
(Also if you still can’t get it, I can give you my email and you can send me some pictures. I’d be more than happy to make a collage or two for you. Just let me know! No pressure though. If you want to do it, you go for it! ;))