Put this file anywhere on your computer; when you run it, you will bypass the required update on steam; so you only have to update when you want to.

IgnoreBeatSaberUpdate.bat

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:: Description                                                                       ::
::                                                                                   ::
:: This script allows you to bypass the blue "Update Required" button in steam       ::
:: by simply copying all files away from the beat saber folder, then asking steam    ::
:: to redownload the entire game, once that finishes you must click a key in the     ::
:: script, and then all files will be copied back to the beat saber folder           ::
:: This allows you to play the game through steam as usual without updating the game ::
::                                                                                   ::
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
:: How to use the script:                                                             ::
::                                                                                    ::
:: If you have Beat Saber Installed in default location, no changes required          ::
::      Otherwise change "C:\Program Files (x86)\Steam\steamapps\common\Beat Saber"   ::
::      to your installation path everywhere down below.                              ::
::                                                                                    ::
:: IMPORTANT: You must wait for beat saber to finish downloading, if you do not,      ::
::           there will be a backup folder in the directory where the script is       ::
::           located, but it could screw up steam files within the beat saber folder  ::
::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
:: Made by PtxDK                                                        ::
:: If this tiny script helped you, please considder subscribing to      ::
:: My YouTube Channel: https://www.youtube.com/user/PtxDK               ::
:: It has VR content, mostly Beat Saber plays :)                        ::
::                                                                      ::
:: If you want to meetup and talk some scripting, feel free to join     ::
:: My Discord as well: https://discord.gg/evpAfx6                       ::
::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

@echo off

taskkill /F /IM "Beat Saber.exe"

:start
cls

rem Delete all contents of folder
del /q "CurrentOldVersion\*"
FOR /D %%p IN ("CurrentOldVersion\*.*") DO rmdir "%%p" /s /q

xcopy /s /i "C:\Program Files (x86)\Steam\steamapps\common\Beat Saber" "CurrentOldVersion"

rem Delete all contents of the steam beat saber folder
del /q "C:\Program Files (x86)\Steam\steamapps\common\Beat Saber\*"
FOR /D %%p IN ("C:\Program Files (x86)\Steam\steamapps\common\Beat Saber\*.*") DO rmdir "%%p" /s /q

rem Validate the game, to let steam think it is launching the newest version
start steam://validate/620980

cls
echo DO NOT PRESS ANY KEY UNTILL DOWNLOAD IS COMPLETE
echo IMPORTANT: Go into steam and look at beat saber
echo when the green play button appears, click a key in this terminal window
PAUSE

rem Delete all contents of the steam beat saber folder
del /q "C:\Program Files (x86)\Steam\steamapps\common\Beat Saber\*"
FOR /D %%p IN ("C:\Program Files (x86)\Steam\steamapps\common\Beat Saber\*.*") DO rmdir "%%p" /s /q

rem Copy the old version of Beat Saber, back into the steam beat saber folder
xcopy /s /i "CurrentOldVersion" "C:\Program Files (x86)\Steam\steamapps\common\Beat Saber"

rem also add option to launch beat saber?...
:: start steam://run/620980

:End
PAUSE