do you want a clean install of el capitan or do you want to upgrade from your current version?
Or do you want to keep your current version and create a partition on the disk and install el Capitan there?
I guess running the dmg file and making the installation from inside the OS seems to be the simplest way, so i guess thats what ill do. I dont mind if its a clean installation or not, nor am i interested in haveing a dedicated partition for elCap ;-)
I made the upgrade to elCapitan but at boot, I cannot get the wireless keyboard and mouse to connect via blue tooth. Its kinda strange that this happens, I mean bluetooth should be working... i wonder if this might be some update that I haven't done yet!
I have upgraded to ElCap and the Mac mini goes very very slow! I cannot work in any way!
I booted from the SnowLeopard bootable dvd to go back to SLeop, and the system will not allow to run the installation file!
This is crazy!
I recommended you an SSD, the hard drive disk is showing its age. A ram upgrade is also recommended, at least to 4 Gb.
I dont think you can return to snow leopard from el capitan now. You probably can only erase the disk and install SL again or create a partition if you want to keep el cap.