How use Redemption that it works independent from other installed software containing own Redemption Version?

Question

We use Redemption Version 5.21 initializing with RedemptionLoader and 32Bit Outlook.
This works perfect on most systems.

Problems occur on Systems, where a third Software is installed, which is using a customized Redemption.dll together with some Registry-Entries by the setup.

[HKEY_CLASSES_ROOT\TypeLib\{2D5E2D34-BED5-4B9F-9793-A31E26E6806E}]
[HKEY_CLASSES_ROOT\TypeLib\{2D5E2D34-BED5-4B9F-9793-A31E26E6806E}\4.5]
@="Redemption Outlook Library. Version 4.5"

[HKEY_CLASSES_ROOT\TypeLib\{2D5E2D34-BED5-4B9F-9793-A31E26E6806E}\4.5\0]

[HKEY_CLASSES_ROOT\TypeLib\{2D5E2D34-BED5-4B9F-9793-A31E26E6806E}\4.5\0\win32]
@="C:\\Program Files (x86)\\...FullFilePathToCustom_dll
[HKEY_CLASSES_ROOT\TypeLib\{2D5E2D34-BED5-4B9F-9793-A31E26E6806E}\4.5\FLAGS]
@="0"

[HKEY_CLASSES_ROOT\TypeLib\{2D5E2D34-BED5-4B9F-9793-A31E26E6806E}\4.5\HELPDIR]
@="C:\\Program Files (x86)\\...DirectoryPath"

When deleting the identified Registry-Keys everything works fine.

With this third-Party software installed there are Problems accessing attachment.ContentID from singed E-Mails and also with decryptedmail = ((IRDOEncryptedMessage)mail).GetDecryptedMessage();

Conclusion:

Third party-Software adds something to registry, that disturbs the RedemptionLoader Initialisation Process. RedemptionLoader Initialisation is not so isolated from System as expected. Running our software independent from third-Party-Installation is a requirement.

Questions:

1. How get rid of the fact, that third party Installations of redemption influence stability?
2. Is this possible with the RedemptionLoader-Approach?
3. Can loading side by side be a solution?