Just in case my Swedish above is too difficult to understand I'll add an English version here:
1. Create a folder on your desktop and name it Standard Accounts.
2. Install Standard Accounts in that folder. When your computer opens up the installation window that prompts you to drag the Standard Accounts file into the applications folder, drag it instead into the new folder you just created. The program will then be installed in the new folder.
4. Start up the program
5. Click on Enter company info -> Connect to company -> Add your customer code -> Search
6. Select your company and click Connect