A few more notes about install stuff - you can extract the S3Ds into your EQ directory and overwrite your current stuff if you want, but then if you want to uninstall EQ Classic HD you'll have to manually replace those S3Ds with the originals. Here are links to the original EQ textures in case you need to do this and you forgot to backup your stuff beforehand:
High-resolution textures:
http://p99.yourfirefly.com/downloads/highres_s3d.zip
Low-resolution textures:
http://p99.yourfirefly.com/downloads/lowres_s3d.zip
EQClassicHD's installer & uninstaller will only work if some certain conditions are met:
- install.bat conditions: before install.bat will run, it must be outside of your EQ directory and in a folder with the downloaded install files.
- uninstall.bat conditions: before uninstall.bat will run, you must have already run the installer which will have created backups of all of your current textures.
So to make things easy, here's what I recommend: unzip the EQClassicHD folder somewhere, then simply run install.bat within that folder. It will auto-backup all of your current stuff, and if you want to stop using EQ Classic HD, all you have to do is run uninstall.bat to restore everything back to how it was before.