Failed to install Resilion Sync Service

[needabettername]

Hi

Trying to resinstall latest version on win10.1909 after resilio lost all syncs.

To uninstall I've:

• Done a normal windows remove programs
• Deleted %appdata%/Resilio*
• Manually deleted the service with sc.exe delete rslsyncsvc through powershell with elevated rights
• Run ccleaner which picked up some resgistry keys but maybe I'm missing some?

When Trying to install resilio I choose the 'add as system service' option  and, at the point I'd expect it to add in username and password I just get a "Failed to install Resilion Sync Service" dialogue box. Though the btsyncsvc_ log  in %LocalTemp it seems to install ok, and a services is installed only without any username

platform: Windows workstation 10.0 amd64
version: 2.6.4.1344
[2020-03-09 12:19:38.455] Registering Resilio Sync Service
[2020-03-09 12:19:38.455] Path: C:\ProgramData\Resilio Sync Service\Resilio Sync.exe
[2020-03-09 12:19:38.455] Autostart: true
[2020-03-09 12:19:38.455] Username: 
[2020-03-09 12:19:38.455] Command line: 
[2020-03-09 12:19:38.455] Get user token: false
[2020-03-09 12:19:38.455] Service name: rslsyncsvc
[2020-03-09 12:19:38.508] Resilio Sync Service is registered successfully

I can't then start the service even if I change it to be under the correct user account, or local account in services.msc - Shows error 5 Accesss is denied.

Eventvwr shows a Event ID 7000 Error -The Resilio Sync Service service failed to start due to the following error:
Access is denied.

Disabling windows defender doesn't seem to make any difference.

Is there somewhere I can download previous versions to rule that out please. Can't seem to find them.

Many thanks in advance for any help you can give.

[Andy+]

Same as here

https://forum.resilio.com/topic/71783-sync-service-wont-start/

I dont know the solution, maybe a compatible mode or admin mode is running.

[needabettername]

Thanks for coming back to me. 
Feels slightly different but I'll bow to you knowledge on that one. I can confirm it's just happening on that machine, rather than other similar windows builds

I'll keep on playing and see if I can work it out, until I get bored and just reinstall windows

[needabettername]

Just in case it helps anyone

Creating a new user account didn't make a difference.
Neither did confirming Login as service for the account under group policy.