FYI we鈥檙e releasing a 3.5.4 with just 2 fixes related to installation on Windows:
- [stable-3.5] Add and use DO_NOT_REBOOT_IN_SILENT=1 parameter for MSI to not reboot during the auto-update. by backportbot-nextcloud[bot] 路 Pull Request #4794 路 nextcloud/desktop 路 GitHub
- Always run MSI with full UI. by allexzander 路 Pull Request #4801 路 nextcloud/desktop 路 GitHub
This should resolve the need to reboot on update on Windows. I thought Windows always has to reboot when you install something but apparently not 
