Be careful of those so called "PS3 emulators" - I've read that many of them either have viruses, malware or browser hijacking trojans built inside the executable. At the very least bad case scenario, they are vaporware (The application does nothing - It's like a joke or hoax program). AFAIK, there is only one "working" PS3 EMU called RPCS3 ->
https://rpcs3.net. It's an "Official" open source project that can run a few PS3 games but is still buggy and requires the latest high end PC hardware to run smoothly - They mentioned that using an Intel 8 core 6900K CPU would help! ->
https://rpcs3.net/faq. If you have $1,000 to spend on a Intel 6900K CPU alone ->
https://www.newegg.com/Product/Produ...82E16819117645 then go for it~! They need to tweak that EMU so that the rest of us peeps with older hardware can really use it! Also, out of the 2023 PS3 titles released, only 135 are playable from start to finish, so that gives you an idea of where the EMU currently stands.
It's not fully developed like the PCSX2 EMU is for PS2 games or like the Dolphin EMU is for Wii games but it's still impressive though. Kingdom Hearts 1.5 Remix is on their Compatibility List as unplayable ("Ingame") ->
https://rpcs3.net/compatibility?c=k. Still, it's good to keep an eye on that EMU and "Wait and see". I've seen those hacked versions of Kingdom Hearts 1.5 for the PC. I think that it's really a crude, highly customized built-in PS3 EMU that's running the specific game's "ROM" but I never tried it. You can try using using the freeware JDownloader download manger application ->
https://board.jdownloader.org/ and see if it helps you.