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Nextcloud desktop 2.6+ for Mac OS X / macOS shall support Mac OS X 10.11 El Capitain to enable legacy Mac equipment in continuity of the NC desktop 2.6.0 version.
Version 2.6.1rc1 requires at least macOS 10.12 Sierra, unfortunately.
Client version: Version 2.6.1rc1 (build 20191018)
version 2.6.1 RC1 is built with Qt 5.12.5 to support OpenSSL 1.1.1d (with TLS 1.3). We're currently upgrading the client to support Qt 5.12 on all platforms for security and (framework) bug fixes. Sadly Qt 5.12 requires at least macOS 10.12
Previous builds were linked against Qt 5.9.2 and OpenSSL 1.0.2 which is only supported till the end of this year and will become a major security risk from then on.
Most recent devices running Mac OS X 10.11 El Capitain should support the upgrade to macOS 10.12 High Sierra, and for general security one should consider upgrading the system, see:
We may consider providing parallel builds with the old Qt and OpenSSL 1.0 till the end of this year, to go with OpenSSL's lifecycle but sadly cannot release security-outdated clients from then anymore.
For more info about Qt's requirements see:
And of course here too, regarding OpenSSL:
Legacy support is one of the things I really in open-source development, but when security needs to be sacrificed for that, an OS upgrade should be the better way ;-/
IMHO one should not camouflage design decisions and human resource plans for development efforts with a term like 'security' as a killer argument.
There is a way OpenSSL 1.1.x is supporting Mac OS X / macOS 10.5 PPC up to 10.14 Intel and beyond, I presume:
Furthermore, there is LibreSSL with TLS 1.3 support for Mac OS X / macOS available:
The Qt Tool Kit is just another cross-platform framework (headers, data, and libraries) for writing cross-platform GUI-based applications.
The the FOSS idea includes the right to repair and the liberty to sustainably reappear:
Supporting Mac OS X / macOS platforms from 10.5 PPC up to 10.14 Intel and beyond:
There may be a reason why a heavily funded international effort and quite accepted scientific community is paying attention to both security and availabilty of legacy equipment besides reaching for future knowledge.