Always back up your original game folder before proceeding. Anti-virus software may flag version switchers as "hack tools" because they modify executable files. This is a false positive.
You cannot play a replay from the 2005 World Cyber Games (WCG) on the latest patch. You cannot host a classic DotA Allstars 6.83b map if your game is updated to patch 1.31. You cannot join a private server running patch 1.26 if your launcher auto-updated to 1.32 (Reforged). warcraft version switcher
The most critical versions for the community include: Always back up your original game folder before proceeding
To ensure safety and security, players should only download the tool from reputable sources, and should always scan the tool for viruses and malware. Additionally, players should be aware that using third-party tools may void their game's warranty, and may also result in account penalties or bans. You cannot play a replay from the 2005
You tried to switch from Reforged (1.32) down to 1.26. The new CASC file structure is incompatible with the old MPQ structure. Solution: You need a "Hybrid" installation. Install a clean 1.26 CD version in a separate folder (e.g., C:\Warcraft 1.26 ) and keep Reforged in another folder. Version switchers work best on classic installations, not Reforged hybrids.
Windows Defender or your antivirus quarantined the switcher's files. Solution: Restore the file from quarantine, add an exception to your Warcraft folder and the switcher folder, then re-run the switcher.