While tempting, using third-party repacks for security-sensitive software like an ad blocker carries risks:
While some community-vetted repacks have reputations for being "clean," using any third-party modification carries risks: AdGuard для Android – Nightly adguard 54sn repack
Unofficial software is a common vector for malware, keyloggers, or hidden miners. Official AdGuard software is open-source and transparent, but repacks are opaque and can be altered after the fact. Lack of Updates: adguard 54sn repack