Our great sponsors
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FTB-App
Electron, Vue2, and Tailwind based frontend system for the FTB App; a new Modpack launcher for FTB and Curse modpacks.
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PrismLauncher
A custom launcher for Minecraft that allows you to easily manage multiple installations of Minecraft at once (Fork of MultiMC)
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Several users (myself included) are experiencing problems with FTB erroring out when trying to launch an existing modpack or downloading a new one, as evidenced by the last few issues raised on Github. It doesn't look like any of the devs have commented on any of the issues yet, and the only suggestion from other users has been to disable any antivirus software, including Windows Defender, which seems like a terrible idea.
Try using Prism launcher instead, from what I know it supports FTB modpacks.