The package should be on the same page where you found the 1.7.0 starter pack, just look up and down the page a bit.
For the FFVII .ECM files, yes. And this is how you convert them.
Zorlon's guide to .ECM and .APE files.
My mistake. Here's the link to ePSXe+BIOS+Plugins v1.6.0, not 1.7.You will need 7zip to extract it, then copy the plugin folder and paste it in your current ePSXe folder. Tell it "No to All" so it doesn't mess with your current plugins.