|  09-23-2021, 08:57 AM | #1 | 
| Junior Member  Posts: 2 Karma: 10 Join Date: Sep 2021 Device: None | 
				
				Update/Installation error on Windows 10
			 
			
			Hi all. Apologies if this has been brought up before but I couldn't find any links when I did a search. I was on v5.21 and getting errors when trying to update up to v5.27. The update would start but get to a point where it would roll back and abort. I then foolishly uninstalled v5.21 and tried a fresh install and it would start installing new files but then hit the same problem. This happens with v5.21 up to v.5.27. I've even tried V5.19 and v5.20. No success. I'd appreciate any suggestions. | 
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|  09-23-2021, 09:04 AM | #2 | 
| Junior Member  Posts: 2 Karma: 10 Join Date: Sep 2021 Device: None | 
			
			After a bit more experimentation, I managed to install v5.27 when I turned off my Windows Antivirus.
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|  09-23-2021, 01:08 PM | #3 | |
| Well trained by Cats            Posts: 31,249 Karma: 61360164 Join Date: Aug 2009 Location: The Central Coast of California Device: Kobo Libra2,Kobo Aura2v1, K4NT(Fixed: New Bat.), Galaxy Tab A | Quote: 
 Is there something odd about your Windows Logon Account? Did you fully exit Calibre (check task manager for remnant processes that may keep a file locked) Oh, and did you do a Cold reboot. Windows updates might have been mid cycle in the update. As an early installer, I sometimes get a warning BEFORE I can install. Where did you get the update? (<hint>Only from the official site is a known safe source) | |
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|  09-23-2021, 01:14 PM | #4 | 
| Resident Curmudgeon            Posts: 80,742 Karma: 150249619 Join Date: Nov 2006 Location: Roslindale, Massachusetts Device: Kobo Libra 2, Kobo Aura H2O, PRS-650, PRS-T1, nook STR, PW3 | 
			
			I'm running Calibre 5.27 under Windows 10 with Defender.No problem at all.
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|  09-23-2021, 05:29 PM | #5 | 
| null operator (he/him)            Posts: 22,010 Karma: 30277294 Join Date: Mar 2012 Location: Sydney Australia Device: none | |
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|  09-23-2021, 05:36 PM | #6 | 
| null operator (he/him)            Posts: 22,010 Karma: 30277294 Join Date: Mar 2012 Location: Sydney Australia Device: none | |
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|  09-24-2021, 12:04 PM | #7 | 
| Guru            Posts: 608 Karma: 5007204 Join Date: Sep 2014 Location: Calif Device: Fire hdx 8.9, Tab S2, Tab S5e, Aura ONE | 
			
			Trying to update from 5.2.7 to 5.2.8 & got error claiming error of able to access Calibre2\app\bin\2d704824.rbf. Problem is that it does not exist BUT "2d704825.rbf" exist with the date of the install attempt. Do not know if the error is with the installer or Calibre as it is 1 digit off. | 
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|  09-24-2021, 12:56 PM | #8 | 
| Custom User Title            Posts: 11,351 Karma: 79528341 Join Date: Oct 2018 Location: Canada Device: Kobo Libra H2O, formerly Aura HD | 
			
			Just out of curiosity, but is Windows' built-in ransomware protection turned on? It's known for false positives.
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|  09-24-2021, 01:34 PM | #9 | |
| Enthusiast  Posts: 42 Karma: 10 Join Date: Sep 2012 Device: Kobo Aura | Quote: 
 See attached screenshot. I even manually changed the security permissions just for that file, still didn't help. I tried installing with and without Windows Defender activated, still same issue. Have never had a problem updating via msi until now (tried each msi i downloaded from all the links on the website, in case one of them was borked). Any ideas? So weird. | |
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|  09-24-2021, 02:03 PM | #10 | 
| Well trained by Cats            Posts: 31,249 Karma: 61360164 Join Date: Aug 2009 Location: The Central Coast of California Device: Kobo Libra2,Kobo Aura2v1, K4NT(Fixed: New Bat.), Galaxy Tab A | 
			
			I suspect that file is a R(oll)B(ack)F(ile), thus the serial numbering. (It, .RBF, does not exist after a successful install) Someone suggested turning Off 'Ransome Ware Protection' | 
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|  09-24-2021, 02:35 PM | #11 | 
| Enthusiast  Posts: 42 Karma: 10 Join Date: Sep 2012 Device: Kobo Aura | 
			
			The weird part is, that it's a 0 byte-size file. It creates a new one each time you execute the msi. I do have ransomware protection turned on, but I got the same error with it turned off, so I don't think that's it. Also the controlled folder path is in \User\[username]\Documents - not program installation paths.
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|  09-24-2021, 03:41 PM | #12 | |
| Well trained by Cats            Posts: 31,249 Karma: 61360164 Join Date: Aug 2009 Location: The Central Coast of California Device: Kobo Libra2,Kobo Aura2v1, K4NT(Fixed: New Bat.), Galaxy Tab A | Quote: 
 Are you running JUST Windows (MS) Security? | |
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|  09-24-2021, 04:04 PM | #13 | 
| Enthusiast  Posts: 42 Karma: 10 Join Date: Sep 2012 Device: Kobo Aura | |
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|  09-24-2021, 06:13 PM | #14 | |
| null operator (he/him)            Posts: 22,010 Karma: 30277294 Join Date: Mar 2012 Location: Sydney Australia Device: none | Quote: 
 Good pickup Maybe someone could try TEMPORARILY disabling the MSI Rollback functionality, see ==>> Basics of MSI Rollback BR Last edited by BetterRed; 09-24-2021 at 07:40 PM. | |
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|  09-24-2021, 06:20 PM | #15 | 
| Well trained by Cats            Posts: 31,249 Karma: 61360164 Join Date: Aug 2009 Location: The Central Coast of California Device: Kobo Libra2,Kobo Aura2v1, K4NT(Fixed: New Bat.), Galaxy Tab A | 
			
			BR I have the latest Calibre now installed on 3 W10 systems. 2 are Pro, 1 is Home Calibre installed fine. OTOH  Windows... those 3 do not look, play or behave  the same on my home  (not a domain) network, for quite a while (they did, Now I can't see them all from various. A sees B but not C. C sees B B sees A). | 
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