On your PC, open Sonic Runners Reloaded.
Go to Settings → Data Options.
Click on the File Path, and it will automatically take you to the location of the SRR-Database.ini file.
Back up your SRR-Database.ini file into either a Flash Drive or Google Drive.
On your new PC, open Sonic Runners Reloaded and type a new username (don't worry, it's only temporary).
Go to Settings → Data Options.
Click on the File Path, and it will automatically take you to the location of the SRR-Database.ini file.
Replace the current SRR-Database.ini file with your backed up SRR-Database.ini file from your Google Drive or Flash Drive.
You can enjoy playing Sonic Runners Reloaded on your new PC.
For PC to Android transfers, please follow steps 1-4 in the PC guide, and then follow steps 5-10 in the Android guide.
WARNING: If you decided to edit your save through the ini file, it is considered cheating, and you will become ineligible for both leaderboards in Story Mode/Free Play Mode and Timed Mode.