Well, during the installation of Sage 50 software, some modifications may need to be made to your Windows computer. For this, administrative rights will be required. Thus, even if the users have been granted limited access, they would be unable to install or run a particular program. If these changes are not made, Fix sage error code 1603 might be observed. To change the user access settings, you are required to carry out the steps inclined below:

1. Initially, head to the Control Panel on your system. 

2. Now, locate and select User Accounts.

3. Click on the Change User Account and Settings option.

4. In the end, the users will see a vertical bar; using this, you select what level of access should be given to users.