Open Microsoft PAINT
Find and open the Logo.
Click on RESIZE.
If it just needs to be enlarged or reduced with the same dimensions, click on PIXELS.
The recommended max size options for a logo are about 356px X 100px for invoices, quotes, FastTrack invoices, repairs etc.
Overtype the 'Horizontal' and the rest will be automatically updated.
Save it to your preferred folder.
In MANAGE, find and select Configure System Settings under either the menu SYSTEM, or under USER PROFILE > ENVIRONMENTS
Go to SYSTEM then to COMPANY INFORMATION.
There is a search option at the end of the COMPANY NAME field.
Click it and you will be able to upload the logo.
Do a test reprint on a document and adjust the logo in Paint until it suits your purposes.