I still use RABCDasm since I have it open for editing anyway, plus Yogda is for Windows only, as is the hexer app. So for you fellow Mac users, this is one option.
Always in Parameters.class.asasm
~/rabcasm/client-1/com/company/assembleegameclient/parameters/Parameters.class.asasm
You will find 2 instances of the version number in here. Change - save - compile
The other is:
trait const QName(PackageNamespace(""), "_-0-J") slotid 1 type QName(PackageNamespace(""), "String") value Utf8("12.4") end