When Acronis software cannot be installed with error "%1 is not a valid Win32 application", "Unknown publisher" or other, or hangs, you may want to check if Acronis installation file has been downloaded correctly. It can be done either by checking the digital signature of the installation file or by comparing its checksum to the correct checksum, available under Acronis account.
Provided solution can also be used to verify that there have been no unauthorized changes to the Acronis True Image installation package (build) by a third-party.
Method 1: Check if the installation file has a valid Acronis digital signature.
- Right-click on the downloaded Acronis installation file, select Properties, click on the Digital Signatures tab.
- The list of digital signatures should be presented. If Digital Signatures tab is missing or empty, please re-download Acronis installation file using other web browser or even from a different computer, then check if Acronis digital signatures are listed under Digital Signatures tab. There could be one or more digital signatures. If you see just one, it is totally correct and you can proceed to the next step.
- Click on each of the signatures in the list to select them, and then click Details button. The status text just below "Digital Signature Information" should be saying This digital signature is OK and Acronis should be in the Signer information - Name field.
If there is other status text, a warning, an error, or the window "Digital Signature Details" does not open at all, the installation file must have been downloaded incorrectly. Use a different web browser or even a different computer to re-download it. Do not use any download accelerators as they may be the cause of corrupted downloads.
Method 2. Verify the checksum of the installation file
You can check that the installation file is not corrupted, damaged or altered in any way by calculating its checksum (fingerprint) and comparing it to the correct checksum, displayed under Acronis account.
If they match, you can be sure that the installation file was downloaded correctly and is exactly what we have on our servers.
If they do not match, the installation file should not be used for installation. It must have been downloaded incompletely, incorrectly or was damaged or corrupted during or after the download by other programs. In this case try downloading the file again from Acronis account using a different browser with disabled download accelerators (if any), or even from a different computer, from a different network.
MD5 checksum can be calculated either by using a third-party software or by using a native Microsoft Windows command-line tool certutil.
Step 2. Compare it to the correct MD5 checksum at Acronis website
The download section of Acronis account web page shows MD5 checksums of the installation files, so that you can verify the integrity of the downloaded file and check if it has been downloaded correctly.
- Sign into your Acronis account at https://account.acronis.com and locate the product in the registered products list,
- If you do not see your product in the list, click "Add keys" and register your product license key. Boxed versions owners: click here to get the full registration key.
- Click Downloads button in the corresponding product section and move the mouse cursor over the checksum text.
- The MD5 checksum will be displayed and the text will be selected automatically. If you are viewing this page from a different computer, you can press Ctrl+C on the keyboard to copy it to the clipboard to save it, e.g. into a Notepad document.
(!) To calculate checksum in Linux, open a terminal and issue the following command:
$ md5sum [file]