Downloads]$ pacman -U ./megasync-x86_64.pkg.tar.zst
error: you cannot perform this operation unless you are root.
Downloads]$ sudo pacman -U ./megasync-x86_64.pkg.tar.zst
[sudo] password for :
loading packages...
resolving dependencies...
looking for conflicting packages...

Packages (1) megasync-4.5.3-1

Total Installed Size:  41.06 MiB

:: Proceed with installation? [Y/n] Y
(1/1) checking keys in keyring                             [################################] 100%
(1/1) checking package integrity                           [################################] 100%
(1/1) loading package files                                [################################] 100%
(1/1) checking for file conflicts                          [################################] 100%
(1/1) checking available disk space                        [################################] 100%
:: Processing package changes...
(1/1) installing megasync                                  [################################] 100%
==> Updating trust database...
gpg: next trustdb check due at 2021-12-01
  -> Locally signed 1 keys.
==> Updating trust database...
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 786C63F330D7CB92: no user ID for key signature packet of class 10
gpg: key 1EB2638FF56C0C53: no user ID for key signature packet of class 10
gpg: key 1EB2638FF56C0C53: no user ID for key signature packet of class 10
gpg: marginals needed: 3  completes needed: 1  trust model: pgp
gpg: depth: 0  valid:   1  signed:  28  trust: 0-, 0q, 0n, 0m, 0f, 1u
gpg: depth: 1  valid:  28  signed:  84  trust: 1-, 0q, 0n, 27m, 0f, 0u
gpg: depth: 2  valid:  78  signed:  25  trust: 78-, 0q, 0n, 0m, 0f, 0u
gpg: next trustdb check due at 2021-12-01
fs.inotify.max_user_watches = 524288
Optional dependencies for megasync
    sni-qt: fix systray issue on KDE and LXQt,
    nautilus-megasync: for integration with nautilus
:: Running post-transaction hooks...
(1/4) Arming ConditionNeedsUpdate...
(2/4) Refreshing PackageKit...
(3/4) Updating icon theme caches...
(4/4) Updating the desktop file MIME type cache...
Downloads]$