Bootstrap allows one to easily catch up the blocks instead of allowing the desktop wallet to download all the needed blocks. This bootstrap contains all the blocks leading up to April 2, 2018.

For Windows, download the Bootstrap from https://mega.nz/#!wBwSnQpB!eJ-gERywChfM4N4f7In04acaAdtPQPkKdO33h7tC8NA

For MAC, download the Bootstrap from https://mega.nz/#!pQg3zJwL!ucl4rMftU5duzE5SNcWfhH2NrrIZNlrGOtWvxGELL2Q

Extracting the Bootstrap:
Windows
Click on Start then search for %appdata%, this should take you to Roaming folder
Open the TOA folder but if there’s none, make sure you opened the Windows wallet before since this creates the initial TOA folder.
Move or copy the bootstrap file to the TOA folder then extract
Open the TOA Windows wallet again and let it sync/download the remaining blocks.

MAC
Click on Spotlight icon in the upper right corner of the screen then search for ~/Library
Then open the folder named Application Support then open the TOA folder
Move or copy the bootstrap file to the TOA folder then extract
Open the MAC Wallet again and let it sync/download the remaining blocks.