For a legal, portable Beta 1.7.3 experience, purchase Minecraft and use the official launcher's "Beta 1.7.3" option – then copy the .minecraft folder manually.

Minecraft Beta 1.7.3 Cracked -portable- -updata... Official

For a legal, portable Beta 1.7.3 experience, purchase Minecraft and use the official launcher's "Beta 1.7.3" option – then copy the .minecraft folder manually.