I have downloaded "The New Tekkit Classic" modpack. Others i have tried and received same issue: Tekxit 3 (Official 1.12.2) and Tekkit Classic and Tekkit Legends.
It installs fine as far as i can tell.
When i launch the modpack the launcher will disappear for a few seconds and then reappear.
I have tried every solution i have found online including Updating my graphics drivers, i have Oracle java as well as java it self (64 bit).
I have also installed all of my windows updates.
https://pastebin.com/h2yLE1Lf
this is a fresh log report from a single attempt at launching and it failing.
any information is appreciated!