Add crash-reports with sites like https://paste.ee/ and paste the link to it here
There is an issue with decorative_blocks - maybe a conflict with Optifine
Make a test without Optifine first - if there is no change, remove decorative_blocks
You have to import modpack zip files with Custom Launchers like MultiMC or AT Launcher - there is a "Import Modpack" function
Use "Import Modpack from Zip"