I didn't actually tell you to delete the whole directory !
Just the dat file.
But probably no harm done

You don't need to reinstall SketchUp.
Just Repair it.
Close SketchUp.
Right-click on the SketchUp installer's exe file's icon [in Downloads] > Run as administrator... choose Repair.
Do not 'run' SketchUp as administrator, it can cause permission issues.
Your normal user-account might have some 'admin-powers' but that's not the same thing...
Do not Run the installer by double-clicking it - that can cause unpredictable permissions issues.
As far as the:
C:/Users/greg_/AppData/Local/LIBFREDO6_DATA_Dir/LibFredo6_all_defaults.dat
issue is concerned, I'd delete that dat file [or move it out of the way in case of a mess-up in the next step, so you can back-step to where you were].
Alternatively right-click on the dat file's icon and use Security > Permissions > Edit to give FULL control to everything that is listed...
When SketchUp restarts it should be remade with default settings and permissions...

@DIPINACHARI

You are doing it already !
Write a clear message outlining your issue[s] and someone will reply.
At weekends and holidays replies might not be instant.
In more difficult circumstances you can communicate by Private Message [Chat] - but you need a few posts before you are allowed to do that - or email with SketchUcation's support team...

How did you rename the user-account ?
Can you revert it back and make a new account 'FJS' and transfer all of your settings over to the new account ?
There's lots on line about that...
e.g.
https://learn.microsoft.com/en-us/answers/questions/914152/link-the-new-user-profile-to-existing-user-profile

Try repairing, or reinstalling SketchUp whilst in the other named user-account, that should use the correct path without the umlaut.
How did you change the user-name ?
What does Windows think your username is ?

@hamsalah

As well as the weirdness of you having installed v1 rather than v15 [firstly, please install the latest one !], the SketchUp error message you provided shows a number of problems loading several other extensions as SketchUp starts - including those which ship with SketchUp and should be auto-copied over to your user's Plugins folder as SketchUp first runs.

If SketchUp was not installed properly it can result in unexpected issues, often relating to folder/file permissions.
You might sometimes muddle through unscathed, but I suspect this is the case here.

Luckily it can often be fixed without uninstalling/reinstalling SketchUp or any of your extensions etc.
Follow these steps.
Close SketchUp.
Find the SketchUp installer's exe file - usually found in your Downloads folder [if not download a new copy, or dig out your old one].
Select the exe file's icon, right-click > context-menu > Run as administrator
When prompted choose 'Repair'
When it's finished restart SketchUp and see if the situation improves.

Double-clicking an installer's exe file to 'Run' it is not the same thing, even if your user-account has admin powers.

@Miss-Lazy
And also that your member-name is written exactly as in the tag above... but perhaps with a <space> instead of the hyphen - ?

@Aurora2017SRL
This extension [actually a plugin] is well over a decade old !
It's also encrypted in the old RBS format.
It's unlikely to get updated.

Luckily the toolbar's code is in the editable RB file...
Find the file in Plugins, it's named Helix-along-curve-tool-0.9.rb
Edit it with a plain text editor [Notepad++ or on MAC bbedit || wrangler ?]
Find the line
helixD_bar.show
and edit it, adding extra text to read
helixD_bar.show if helixD_bar.get_last_state.abs == 1 # TB_VISIBLE/NEVER
Save the changes and restart SketchUp.
Now the toolbar's status will be remembered across sessions - i.e. either visible or off

You linked to nothing useful on Facebook !
Can you edit this to give a proper link...

@Gus-R
All of your custom-templates must be located in a specific location.
Typically on a PC it's

C:\Users\YOURUSERNAME\AppData\Roaming\SketchUp\SketchUp 20nn\SketchUp\Templates

Where you add your own user-name and edit the nn to your current SketchUp version

Unlike other folder locations this path is not editable.
So does that folder exist ?
If not, then you need to make it, and ensure it has 'full' read/write' permissions etc.
Adjust your Preference settings accordingly.

It was flaky last week, when drag-n-drop of the RBZ didn't work on some specific OSs, but then navigating to the RBZ file and selecting it would still work...
I'm surprised it's not been properly fixed by now.

@gna-young
What was your solution ? [for other members who might have similar issues]

There are a number of posts about related error messages.
The licensing system cannot read the license file's details properly.
If you have renamed your computer it with cause an issue -
but this is often because your windows-computer-name [or sometimes your windows-user-name] contains invalid characters.
So perhaps change you computer-name [and perhaps your user-name] to have only ASCII characters and some limited punctuation, delete the license file, as suggested by the error message, then relicense...
This should side step the issue...
Naming conventions link text see here...

@Gábor needs to become involved...
but these error messages relate to issues with your licensing file - e.g. your Computer's name contains non-ASCII characters that can't be decoded or your User-name is similarly badly formed...

A very basic outline of what he hopes for is hardly going to let his cat out of the bag.
It might well be that something already exists, or is readily modified to suit.
He's unlike to get any meaningful response without a little more info...

If you outline the basic ideas behind it then you are likely to get a response or help...

@kngpw said in [Plugin Library] LibFredo6 - v15.0a - 31 Dec 24:

@fredo6
I do! I only change the real Windows computername posting here for privacy reason.

Non-ASCII characters in a computer-name is against Windows requirements and can break things like licensing !

@Didier-Bur needs to fix this - it's his baby...

In my UK jurisdiction, and I suspect many more, you are not allowed 'winders' but 'tapered treads'.
The calculation of the dimensions is convoluted.
The minimum 'going' is 50mm [2"] and any tapering tread at the centerline must have a 'going' measured square to the nosing equal to all the other non-tapering treads.
For non-domestic wider stairs the measurements are taken measured in from the sides - about 1/3 each.
The 'going' is not the 'tread' dimension - the overhang of the nosing is taken off the tread size, so it's the 'plan' dimension.
When you get to anything other than a simple staircase it can become very complicated to 'automate'.
In the UK a helical stair [aka 'spiral'] even has a set of alternative British Standard staircase rules which differ significantly from the usual stair Building Regs - you need to tell the local inspector which one you're using otherwise you could fail.
I've mentioned before about the handrail requirements in the regs to extend 300mm [12"] beyond the top and bottom nosings in many situations, and the landing's going the be 300mm longer than the stair width.
Also, staggering the nosings by one going as the stair turns at a half-landing [or top] means that the handrail transitions smoothly without any need for a vertical portion to make it work...

@svorleak

So its trial period is ending, and to use it after 8 Feb you need to buy/download/activate a license [currently $30?]
There's lots of help in posts and on SketchUcation about how to do this...
There's even a "Help on Licensing..." button on the dialog you showed us.