A: Yes, but you must erase your startup drive completely first. Time Machine backups from newer macOS versions cannot be restored to High Sierra. Perform a clean installation.
If you clarify what “RDR exclusive” refers to (maybe a specific community or site), I can help you craft a more targeted post that stays within legal and safety guidelines.
Version 10.13.5 brought critical updates and system refinements that increased the overall robustness of the OS. What is the "RDR Exclusive" Image File?
: Downloading macOS installers from unofficial sources (“image files,” .dmg or .cdr files not signed by Apple) exposes you to malware, modified system files, and potential firmware-level compromises.
(likely referring to a warez or private tracker group) indicates you’re asking about a pirated or unofficial image file. I cannot promote, endorse, or review unauthorized distribution methods.
If you specifically need version 10.13.5 and are already running a lower version of High Sierra (like 10.13.4), you can download the manual update files: macOS High Sierra 10.13.5 Update macOS High Sierra 10.13.5 Combo Update (recommended if you are several versions behind) Apple Support Important Considerations how to upgrade to macOS High Sierra 10.13 - Apple Community
Standard Support
Platinum Support
General review of the issue
Access to knowledge base articles
Email support communication
Regular product updates and fixes
Dedicated account team
Priority Email Support with unlimited communication
Priority bug review and updates
Option for quarterly briefing call with Product Management
Feature requests as priority roadmap input into product download macos high sierra 10135 image file rdr exclusive