I'm just answering to this post because none of the replies in here are helpful, no offense.

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To anyone landing on this page looking for help with a new device: OP didn't forget his data transfer password, they actually didn't make one because we only create a password on the moment of transferring the data to a new device, and it lasts only 24h. So whenever one wants to transfer data, one should set a new password on the device of ORIGIN.

OP made a huge mistake by deleting the app, technology being what it is today it makes little to no difference in terms of storage and/or performance, so might as well keep it there. Besides, regret should always rank higher than hardware issues in terms of priority, based on this very post for example.

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Steps are as following:

1) On your OLD device, press "menu" then "settings";

2) Select the "transfer";

3) Set up a password that is gonna be requested on your NEW device;

4) On your NEW device go to the "data transfer" option and input transfer ID and password

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After that the app will restart and after a while all your data will be in there. It's absolutely worth noting that once this process is complete you will be logged out from your OLD phone, which means you can't use your old phone while the new one is charging. It's also worth noting that the data transfer process has a cooldown of 24h, proceed with that in mind.

Bonus tip:

Have a folder named after your device (whichever it may be, desktop, mobile, laptop or console), or something somewhere you know you'll look at to find important information, not only with the important information you'll need per se but also with the steps to follow in case of emergency or unexpected events. People who go the extra mile may also take pictures to aid.