In rare cases, it is possible that when uninstalling Dewesoft not all the files were removed. This might cause an issue when installing the Dewesoft back to the computer. 

To resolve this issue you will have to go to Windows registry and delete some of the keys manually. Depending on a version of Dewesoft that you are trying to install you will need to use a different search keyword. 

Here you can find the list of available Dewesoft versions:

Official release version:

32-bit: d3d66bee-55fd-4774-a081-4321bdf00ad4

64-bit: 91C543C5-430E-4523-B403-A98B78B5B8A3

Release candidate - test version:

32-bit: B7908155-8887-43F1-83FD-2F44232D39C2

64-bit: 8CC94028-F799-40EC-A9DD-44D84CFC2E0A

Unstable - development version

32-bit: d229c698-49c8-4573-b6d9-e49a57463a37 

64-bit: 8C59DB45-EE37-4D01-8AA3-BC84992A37EB

For example we will use the 64-bit release version:

Option 1. Using Windows registry:

1. First go to the Window registry (open start menu and type in "regedit").

2. When the registry editor is opened press Ctrl+F buttons and the search window will open. 

3. Copy the key of the correct Dewesoft version in "Find what" window and click "Find Next".

4. When the registry editor finds a file with this name, delete it:

5. Press F3 key on the keyboard to find the next file. Repeat the process until the Registry editor no longer finds the file with this name. 

6. The installation of Dewesoft should now work without any problems

Option 2. Using a 3rd party tool Nirsoft RegScanner:

This is a faster solution but it requires the usage of 3rd party software.

1. Download and run the Nirsoft RegScanner from their web page:

2. When the software launches copy the key to Find String field, select all options in "Scan the following base keys:" and click the Scan button:

3. Select all found files and delete them:

4. The installation of Dewesoft should now work without any problems