At this point, the game may or may not play. If it doesn't play, then you'd need to try downloading a BIN from elsewhere containing a CUE sheet. Or look for non-CUE-sheet-based ISOs in the following format: ISO, CCD, IMG, SUB, MDF, MDS, and CDZ.
To play PS2 games on your computer, you need to download and configure PS2 BIOS. You can get the detailed information about it from this post: PCSX2/PS2 (PlayStation 2) BIOS: Definition, Download, and Setup
Ensure that you have a stable and fast Internet connection before trying to download the PS1 BIOS file. Then you can download the correct PS1 BIOS file (SCPH1001.bin) by clicking here. What you need to do now is to wait patiently until the download process ends. 781b155fdc