Since v4.255:
 - Modpack installs are now being properly incremented again.

Since v4.251:
 - In situations where the local environment prevents the Launcher from setting java properties the way it wants, the Launcher will no longer restart itself endlessly in attempts to fix the java properties.

Since v4.238:
 - There is now the capability to select the java version which Minecraft will run with in the Java tab of Launcher Options.  By default, Minecraft will run with the same version of java which is running the launcher, but you may configure it to select an individual version of java installed on your system, or to use the highest-versioned 64-bit version of java known to the launcher.
 - The launcher will now be usable after launching minecraft if the launch action "Stay Open" is chosen in Launcher Options.
 - Improved some logging when the launcher fails to pull version info from a pack's linked solder.
 - Made some improvements to launcher behavior when overwriting the existing launcher during an update, in order to allow us to better diagnose problems that users encounter.
 - The launcher will no longer fail to update when placed in a directory whose path includes + symbols.