Not sure how you tried to install it, but I managed to install it with docker a couple years back. Not sure it's still up to date but here's the docker-compose
version: '3.3'
services:
cryptpad:
environment:
- CPAD_MAIN_DOMAIN=example.com
- CPAD_SANDBOX_DOMAIN=sandbox.example.com
volumes:
- '${PWD}/data/blob:/cryptpad/blob'
- '${PWD}/data/block:/cryptpad/block'
- '${PWD}/customize:/cryptpad/customize'
- '${PWD}/data/data:/cryptpad/data'
- '${PWD}/data/files:/cryptpad/datastore'
- '${PWD}/config.js:/cryptpad/config/config.js'
ports:
- '3000:3000'
- '3001:3001'
image: promasu/cryptpad
You can also try onlyoffice or collabora. Have also a look at this.