Quote:Any hints about the path to be installed?

In the Heroes root folder, of cause.

Quote:Will affect the 3.58 editor?

No

Quote:the players with 3.58 platform will be able to open and play a map made with 3.59?

It's not a 3.59 one, it's an alternative branch of development. The players need to install Era first. 3.58 is bugged and obsolete platform.

Quote:So far I placed it on the desktop and read the help, waiting for install advice, as I see the SPtraits.txt is having an unusual WoG extension in spells.

It was done for comability with new exe. In fact, only wog spells settings are written there.

For TE commands see updated ERM help. I can upload it, if you don't find it in internet.