Below are instructions from Norton on how to turn off Norton's Download intelligence.
And how to restore a file from Quarantine.
https://support.norton.com/sp/en/us/home/current/search-results?q=download+intellegence
To turn off Download Intelligence
1. In the Norton AntiVirus Online main window, click Settings.
2. In the Settings window, click the Network tab.
3. In the left pane, click Download Intelligence.
4. In the Download Intelligence row, move the On/Off switch to the right to the Off position.
5. In the Settings window, click Apply.
6. In the Security Request dialog box, in the Select the
duration drop-down list, select how long you want to turn off Download
Insight, and then click OK.
7. In the Settings window, click Apply, and then click OK.
To turn on Download Intelligence
1. In the Norton AntiVirus Online main window, click Settings.
2. In the Settings window, click the Network tab.
3. In the left pane, click Download Intelligence.
4. In the Download Intelligence row, move the On/Off switch to the left to the On position.
5. In the Settings window, click Apply, and then click OK.
Restoring an item from the Quarantine
https://support.norton.com/sp/en/us/home/current/solutions/v6200368_NAV_Retail_2013_en_us?q=restore+from+quarantine
Some programs rely on other programs that are classified as security
risks to function. The program may not function if a particular security
file is removed. All of the removed security risks are automatically
backed up in the Security History Quarantine. This way, Norton AntiVirus
lets you restore any risk to regain the functionality of a program that
requires the risk program to run.
For example, a shareware or freeware program that you download may use
adware to keep its price low. In this case, you can allow the security
risk program to remain on your computer or restore it if Spyware
Protection has removed it.
Some quarantined items are successfully disinfected after Norton AntiVirus rescans them. You can also restore such items.
If you restore an item to a directory other than its original location,
it may not function properly. Therefore, it is recommended that you
reinstall the program.
To restore an item from the Quarantine
1. In the Security History window, in the Quarantine view, select the item that you want to restore.
2. In the Details pane, click Options.
3. In the Threat Detected window, do one of the following:
* Click Restore & exclude this file.
This option returns the selected quarantine item to its
original location without repairing it and excludes the item from being
detected in the future scans.
* Click Restore.
This option returns the selected quarantine item to its
original location without repairing it. This option is available only
for manually quarantined items
4. In the Quarantine Restore window, click Yes.
In case of non-viral threats, you can use the option that is
available in this window to exclude the security risk. Norton AntiVirus
does not detect the security risks that you exclude in the future scans.
5. In the Browse for Folder dialog, select the folder or drive where you want to restore the file and then click OK.
6. Click Close.
If you have doubts about the file:
If you have doubts about any file you have downloaded, you can run them through http://virscan.org/.
http://virscan.org/ is a free online service which scans files with with multiple antivirus engines.