The Jolla Store crashes for another reason. If you updated a Jolla app today before updating the OS to 1.0.2.5, you get in a messy situation where a package (jolla-settings-accounts) gets replaced with a newer version that is incompatible with the old store-client. If you have the store UI open, leave it open until you are able to upgrade to 1.0.2.5. If you already find yourself in the situation that the store crashes each time, do a pkcon install store-client and pkill store-client in the Terminal. This requires Developer Mode. Without Developer Mode, AFAIK only a reset to factory default will help.