KnowledgeBase Content Details

June 17, 2020


While trying to download (or install) ChemDraw for Mac using the Flexnet Download Manager, I get the following error message.

“Download Manager 1.5 (2).pkg” can’t be opened because Apple cannot check it for malicious software.


Assuming you are trying to download (or trying to install while downloading) the ChemDraw Prime/Professional 19.1 for Mac installer (cd191.dmg) using Download Manager and you are not able to install "Download Manager 1.5.pkg". If so, try the following steps:

Open your System Preferences and then select "Security & Privacy".
You will find the message, "Download Manager 1.5.pkgwas blocked from use because it is not from an identified developer".
Click on the "Open Anyway" button.
It will show the warning message with the following message.

"Download Manager 1.5.pkg" can't be opened because Apple cannot check it for malicious software" Click the OK button.

Alternatively, login to your Flexnet account through this link, and click on the ChemDraw Prime/Professional or ChemOffice Professional (19.x) hyperlink.

It will open another window. Right click the ChemDraw Prime/Professional - Mac installer cd191.dmg i.e 69.3 MB cd191.dmg (hyperlink), then right click and select "Save As" or "Save Link As" from the context menu (based on your browser) and save the installer on your Desktop.

If needed, review the following URL as a workaround for this issue:

Then retry the installation.

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