# How to install Pikaur on Manjaro 20.2 recent
# Pikaur is one of the best AUR helpers
# 1. Download required packages
sudo pacman -S fakeroot binutils python-commonmark pyalpm make
# 2. Create (temporary) directory for pikaur build and enter it
mkdir ~/pikaur && cd ~/pikaur
# 3. Download PKGBUILD for pikaur:
wget https://raw.githubusercontent.com/actionless/pikaur/master/PKGBUILD
# 4. Make the pikaur package:
makepkg
# 5. Install the generated package:
sudo pacman -U pikaur-git* 
# 6. Back to home & Remove temp directory
cd ~ && rm -rf ~/pikaur
# 7. Install something from AUR:
pikaur -S wire-desktop

Congratulations! Search for packages here: aur.archlinux.org or by issuing "pikaur -Ss package-name".

Good luck