Look for feedback from other users who have downloaded and used the repack. This can give you an idea of what to expect and any potential issues.

If your goal is to play old custom maps on patch 1.26, and do this instead:

Furthermore, version 1.26a is essential for those who still play on private servers or use tools like Eurobattle.net, Gameranger, or RGC (Ranked Gaming Client). While Blizzard’s official Battle.net servers have moved on to the Reforged client, these community-driven platforms allow players to experience the original graphics, balance, and low-latency gameplay that defined the RTS era of the early 2000s. The Tatah Repack ensures that all players are on the same version, preventing "version mismatch" errors during multiplayer sessions.

While "Tatah" is a community-driven repack, it is favored for its "all-in-one" convenience.