You should never see this.
Select a demo and click "Play." You can choose between playdemo (faster) or viewdemo (allows for a seeking/rewind bar).
Use the built-in browser to navigate to your .dem files. You don't even need to keep them in your cstrike folder; the player can launch them from anywhere.
Beyond CS 1.6, it supports other GoldSrc and Source engine games like Team Fortress Classic and Day of Defeat. How to Download and Install complexity demo player cs 1.6 download
Do you need help within the player, or are you having trouble getting the playback controls to appear in-game? [HELP] CompLexity Demo Player - AlliedModders
Even years after its release, the coL Demo Player remains relevant because it fixes the "outdated demo format" errors that often plague older recordings. It is also an invaluable tool for and "Unban Teams" who need to verify SteamIDs and player configs during cheat investigations. Select a demo and click "Play
Ensure you have .NET Framework 3.5 installed on your Windows PC, as the application requires this specific version to run correctly.
If you are looking to take your gameplay to the next level by studying professional executes or simply want an easier way to manage your 20-year-old demo collection, this is the tool you need. Beyond CS 1
Open the program and point it to your hl.exe file (usually located in your Steam common/Half-Life folder).