If you don't usually run scripts, I recommend you use the Easy Setup Script below, which does installation for you.

Otherwise, you'll need to run PowerShell: WinKey+R, type powershell, hit Enter. Then in the taskbar along the screen bottom, right-click the blue icon with >_ on it, and choose 'Run as Administrator'.
Then at the console prompt (PS C:\Users\username>), type Set-ExecutionPolicy Unrestricted, hit Enter.
Then type Y, and hit Enter to confirm. You can now close the second (Administrator titled) window.

Then pick either GitHub or the PS Gallery option below to copy or install from.
Both do the same thing, and you can copy/paste from this README into PowerShell.

The suggested subreddit 'TestSubredditC' is a real subreddit name that takes just seconds to archive, and should be used as the default when installing packages on the first script run.
The script is then expected to be supplied with a list of subreddit names, usually along with the -Background parameter, so you can lock your screen while the script continues to run.

The Task Scheduler can be accessed by pressing the Windows key, typing the partial name 'Task S', then clicking 'Task Scheduler', or: press WinKey+R, type taskschd.msc, hit Enter. The new task can be renamed (via right-click > Export..., then Actions > Import Task...) and rescheduled to retrigger, archiving the same subreddits in the description monthly, etc. If the task name is unchanged, it will be overwritten when the script is run from the command line again, such as when you update the script. Note that if the running task is ended manually (right-click > End), you will need to manually kill the orphaned python process in Task Manager (CTRL+ALT+DEL), or simply reboot before retrying.
For problems with the PS Gallery, try Uninstall-Script first, then try removing local copies of the script:
PS> Uninstall-Script New-SubredditHTMLArchive (command needs an elevated/admin PowerShell window) PS> ($env:path).Split(';') | % {if (Test-Path "$_\New-SubredditHTMLArchive.ps1"){start "$_"}}

The finished HTML archives and ZIP path are in the task description, and the end of the transcript.

Easy Setup Script

1. Click to open: https://raw.githubusercontent.com/mbarr564/New-SubredditHTMLArchive/main/setup.cmd
2. Once open, choose "File > Save Page As" (or CTRL+S), and choose the Desktop as the save location.
3. From the Desktop (WinKey+D), right-click setup.cmd, click properties, tick "unblock" box, and OK.
4. Then right-click setup.cmd again, and this time click "Run as administrator", and approve prompts.
   Note: There's no message upon script completion, but re-running should now display usage examples.

GitHub: Example Usage

1. PS> Invoke-WebRequest -URI https://raw.githubusercontent.com/mbarr564/New-SubredditHTMLArchive/main/New-SubredditHTMLArchive.ps1 -OutFile .\New-SubredditHTMLArchive.ps1
2. PS> .\New-SubredditHTMLArchive.ps1 -Subreddit 'TestSubredditC' -InstallPackages
3. PS> .\New-SubredditHTMLArchive.ps1 -Subreddits 'AmateurRadio','HackRF','GNURadio' -Background

PowerShell Gallery: Install

1. PS> Install-Script -Name New-SubredditHTMLArchive
2. PS> New-SubredditHTMLArchive.ps1 -Subreddit 'TestSubredditC' -InstallPackages
3. PS> New-SubredditHTMLArchive.ps1 -Subreddits (Get-Content "$($env:USERPROFILE)\Desktop\subs.txt")

PowerShell Gallery: Update

1. PS> Update-Script -Name New-SubredditHTMLArchive
2. PS> New-SubredditHTMLArchive.ps1 -Subreddits 'NetSec','NeuroScience','HomeLab' -Background

Comment Based Help (Script Header)

1. PS> Set-ExecutionPolicy -ExecutionPolicy Unrestricted -Scope Process
2. PS> Get-Content .\New-SubredditHTMLArchive.ps1 | Select -Skip 7 | Set-Content "$($env:temp)\temp.ps1"
3. PS> Get-Help -Name "$($env:temp)\temp.ps1" -Full

Screenshots

The script will run and make itself into a task called 'RunOnce' in Task Scheduler (taskschd.msc):

Then seconds later, that created task will run, and by default will pop up an interactive console:

If run with the -Background switch parameter, you will instead see the path to the transcript log:

Added features since initial release

• Missing dependency package installation with the new -InstallPackages parameter.
  1. Outputs list of installed Python modules, and does prerequisite checks for winget.
• Support for arrays of subreddit names with the new -Subreddits parameter.
  1. Generates master index.html linking to all archived subreddit index files.
  2. Compresses master index and all HTML archive folders into a portable ZIP file.
• Assisted GitHub authentication step, progress bar, and subreddit input validation.
• Better BDFR-HTML module installation with error/standard output logging.
• BDFR clone operations are now retried up to 10 times, with cumulative sleep.
• Added logs folder and cleaned all folder management code.. all logs now retained.
• Added CTRL+C handling: once restarts clone, twice exits script. Added loop hang detection.
• Script spawns itself as a scheduled task, enabling background runs and rerun scheduling.
• Added -Background parameter to set spawned task LogonType to S4U (no stored password).
• PowerShell Gallery: https://www.powershellgallery.com/packages/New-SubredditHTMLArchive/
• Updated hang detection to not trigger if output JSON/media folder is growing by 1GB/4hrs.
• Checks BDFR logs for repeating errors from a submission ID, and excludes those IDs on retry.
• Now passes partial subreddit JSON clones to BDFR-HTML instead of terminating the script.
• Update 2.1.3: fixed to allow renamed/rescheduled monthly tasks to function as intended.
• Update 2.1.4: subreddits with large media downloads (in JSON folder) excluded from retries.

Release 2.2.2 (May 2023)

• Added setup.cmd batch file, for further simplified first time setup, with usage examples.
• Changed archived media size, to under 5MB, from under 2MB. Added -NoMediaPurge param.
• Removed GitHub CLI prereq completely. Script now uses only git.exe to clone repos.
• Tested with latest stable releases of BDFR (2.6.2), Python (3.11), and Git (2.40.1).
• New tools folder for prereq autoinstall location. Fixed winget install params.
• Added registry LongPathsEnabled as MAX_PATH solution, in setup.cmd batch file.
• Added more log checks for errors, with auto workarounds, for problem submission IDs.
• Updated setup.cmd batch file, to check for all possible execution policy states.

Maintenance Release 2.3 (March 2024)

• Fixed conflicting tools folder winget installation paths, leading to MSI 1603 exit codes.
• Fixed "unable to find the specified registry key" for execution policy, on fresh installs.
• Fixed a console printed error when attempting to clean the does-not-exist-yet logs folder.
• Modified task trigger times to 10 seconds, instead of 5 seconds, for slower machines.
• Timestamped the RunOnce task name, to prevent overwriting of previously generated tasks.
• Validated that despite API 403 forbidden errors, login walled sub clones have linked media.
• Tested with BDFR-HTML (1.4.1) and Python (3.11.8); BDFR-HTML requires downlevel BDFR (2.2.0).
• Future: BDFR auth wrappeer to clone private subreddits; PowerShell for Linux compatibility.