Moin, my own Technic Launcher Modpack only starts the Vanilla version of Minecraft.
My ZIP file consists of the bin, config and mods folders.
The Forge version is the latest 1.15.2, I also renamed it to modpack.jar
I also renamed it to modpack.jar
Did you also specify modpack.jar in the start file?
Maybe you also downloaded the wrong "version". There are thousands of counterfeits on the Forge side. Download the file from the page and try again.