After updating into Filmora 8.7.4 you won't be able to use Effect Pack downloaded from this blog anymore :(
But don't worry. It can still be fixed.
First of all, you need to disconnect your internet connection
Second just install this patch and you can run Filmora without problem ;)
Download: [GoogleDrive]
*Note: You need to turn off your internet connection every opening Filmora
**If you accindentaly connecting your PC to the Internet while opening Filmora, you need to re-apply the patch