Sage Error 1706 No Valid Source Could be Found for Product

Here are steps to delete Windows Temp Folder:

◼ Enter %temp% 
◼ It will display the Run command
◼ Click all files & folders 
◼ Choose Delete 
◼ Click Do this for all active items if a message appears Folder in User 
◼ Choose Skip 
◼ Verify the Opening of Sage 50

Run either the third party tool or Microsoft Fixit tool can fix the registry then fix the installation.

◼ Open the antivirus 
◼ Now install the update as administrator manually 
◼ If you have downloaded using Sage 50 with updates 
◼ Follow the link C:\Users\Public\Documents\Sage Software\Simply Accounting\Download
◼ Now give a right-click on the execution file and then run as administrator

Reboot the system with Sage mode & selective startup mode installs the update.

Missing/pending Windows update that blocking the Install Script may be the reason for this error.

Click on the option named Automatically Install Product Updates to pause the Sage 50 Accounting system from installing the update of the product. Here are the steps to switch Automatic Updates:

◼ Open the Home Page
◼ Click Help option 
◼ Choose About Sage 50 Accounting 
◼ Click Support Info…
◼ Hit Modify Product Update Settings 
◼ Clear the check field named Automatically Download Product updates to pause Sage 50 Accounting using product updates & installing updates
◼ Now clear out the check box labeled Automatically Install Product Updates to pause the product updates installation
◼ Hit OK
◼ Once closed Sage 50 choose the tab labeled Remind Me Later