for the specific Tekkit pack you installed on your server.
: The nostalgic 1.2.5 version with Equivalent Exchange 2. buy tekkit server
To play, you and your friends cannot use the standard Minecraft launcher. the Technic Launcher . Log in with your Microsoft account. for the specific Tekkit pack you installed on your server
: Offers specific installers for Tekkit Classic Reloaded. buy tekkit server
If you'd like, I can help you for these hosts or explain how to allocate more RAM if you're experiencing lag. Which Tekkit version are you planning to play? Tekkit SMP Installation Guide
Once you have purchased your server, you need to install the actual Tekkit files.