If you need a specific version immediately, use these official repositories:
Supports IE6, IE7, and IE8. This is the primary reason developers "downgrade."
Older versions (especially pre-1.12) are susceptible to Cross-Site Scripting (XSS) attacks.
If you use a package manager, you can install a specific version via the command line: npm install jquery@1.12.4 Use code with caution. Method 3: The "Migrate" Plugin
jQuery 3.x is significantly faster and handles memory more efficiently than the 1.x branch.