If you get stuck on "Applying Textures" or anything else related to textures, Please unistall Java 8 and install Java 7 Update 80.
If your game keeps crashing make sure your ram allocated to tekkit is at least 3.5 GB or higher by going to: "Launcher Options" then "Java" then "Memory" and use the drop down to select the ammount of RAM allocated, then restart tekkit.
If your game resumes to keep crashing, please download and install Java 7 Update 80.
Once downloaded open tekkit, go to "Launcher Options" then "Java" then "Minecraft Java Version" then select, "1.7.10_80 64 Bit" (32 bit not tested).
If the game won't download it usually means the pack is being updated!
If you have anymore issue please contact me and I will try to fix it. Thanks!