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I'm not sure if they understood correctly if you were asking Curse (app) for linux or minecraft pack installer solution for curse hosted MC packs. That answer is conflicting with earlier answers if you asked comment for linux solution for MC packs.
@TheEpic5 check https://forum.feed-the-beast.com/threads/ftb-launcher-news.158980/page-18#post-1741264
That should contain answers for continuing using old pack backend/launcher