Valery, old scripts should work. The syntax is 99.9% the same. Negative y-variables became global, but in compatibility mode (ErmLegacySupport=1 in heroes3.ini) they work exactly as they did in WoG 3.58: preserved between WoG 3.58 triggers except functions.

Quick f..t variables became fully local. It means each trigger have its own f..t and it's easy to write safe loops now:

":;" is not a must anymore. !!if/el/en and !!re/br/co may be terminated by single ";". But old syntax is supported too.

I tried TEW a bit and Atlantis after running through converter. Both worked. When you press F11 or when ERM error occurs, look at Debug\Era\erm tracking.erm. You'll find all executed ERM commands with files and line numbers their. Much easier to track issues if any.

Era definitely does not change how combo arts are dissembled: probably it's HD mod bug fix.