If you duplicate your current .jar, dowload the snapshot and replace the .jar (not the copy) with it, you can use the snapshot and later if you want to go back to the old one you delete the snapshot .jar files and rename your old one minecraft.jar. Hope I helped
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Got it refurbished on Newegg for $900.
Intel Core i7 3630QM(2.40GHz)
8GB ram
1TB 5400rpm hard drive
Nvidia Geforce GTX 670mx
Windows 8 64-Bit
1920x1080p screen
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However, if you're willing to go with something refurbished, I would highly recommend the Asus g75vx-bhi7n11 for $900 on Newegg. The graphics card is much better than the one on that computer. Here is the link:
http://www.newegg.com/Product/Product.aspx?Item=N82E16834231136
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As for aliens, I wouldn't be surprised if there was life outside earth.
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*facepalm*
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Feel free to join me anyone
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You're really good by the way!