If I get a new device, can I reinstall products I have purchased?
Yes, you can reinstall your purchased products on new or restored devices (if they are jailbroken). On Cydia's homepage, go to Manage Account and log in with the account you used when previously purchasing those products (a Google or Facebook account), and then tap on Installable Purchases to install them.
Make sure to use the same account you used before. If your purchases do not show up, try logging in with another Google or Facebook account. Try all possible accounts.
(If you have updated your Facebook or Google account email address, make sure to use your account's current email address and password to log into your Facebook or Google account, not any old ones.)