Thank you for your answer, this worked great.
Was able to clean the entire list of old versions this way.
Posts made by HeMaN
Clean up "old version of guest-tools.iso"
I noticed when using XOA and want to attach an iso to a vm (most of the times the guest-tools), there is a long list of previous versions of the guest-tools visible before I can select the actual version.
XCPng-center does not show the "old version of guest-tools.iso" entries.
In XOA I can see there is a storage repository "XCP-ng Tools ISOs" containing the old and actual ISO's, but when I try to delete the old ones I get an error "SR_OPERATION_NOT_SUPPORTED(OpaqueRef:4143d1cc-96b6-aed3-30b8-51aaeb78ff54)"
(This repository is not visible in xcpng-center by the way)
Is there a way to clean up the old guest-tool iso's, or instruct xoa not to show the old version entries just like xcpng-center?