MD5 Error trying to download Inifinity Skyblock

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Not sure if this is related. But you need to install the 64bit version of Java. The line below came from the log you posted. If the java update doesn't fix the issue try either using an older version of Java like 8 25 or try the curse voice launcher.

[18:09:23] [ERROR] MainHelpers.printInfo:64: 32-bit Java in 64-bit operating system. 64-bit Java is required for most mod packs. If you have issues, please try the FTB Lite packs.
 
Isn't md5 an encryption function that associates with the login? Try doing your login and see if that helps or disable firewall.