[GH-ISSUE #426] Not support outlook whose version greater than 2021? #409

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opened 2026-02-25 20:31:34 +03:00 by kerem · 3 comments

kerem commented

2026-02-25 20:31:34 +03:00

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Originally created by @Marerc on GitHub (Jul 24, 2024).
Original GitHub issue: https://github.com/aluxnimm/outlookcaldavsynchronizer/issues/426

Hi, there, very thanks for your tools.

My outlook (ver.2406, MicrosoftOfficeLTSCProfessionalPlus2024Preview) cannot installing this plugin, saying "Specific cast is not valid". Is it because of incompability or my own issues.

Originally created by @Marerc on GitHub (Jul 24, 2024). Original GitHub issue: https://github.com/aluxnimm/outlookcaldavsynchronizer/issues/426 Hi, there, very thanks for your tools. My outlook (ver.2406, MicrosoftOfficeLTSCProfessionalPlus2024Preview) cannot installing this plugin, saying "Specific cast is not valid". Is it because of incompability or my own issues. ![image](https://github.com/user-attachments/assets/8627ff61-3e2c-4759-aa12-352d18df5bc9) ![image](https://github.com/user-attachments/assets/7dee2eb1-defe-4bf7-92f4-e0cd8dcb2d1f)

kerem commented

2026-02-25 20:31:35 +03:00

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@tbnobody commented on GitHub (Jul 24, 2024):

I am running caldavsynchronizer with the latest Microsoft 365 version (monthly channel) without any problem. Not sure on which version 2024 ltsc depends on...

@tbnobody commented on GitHub (Jul 24, 2024): I am running caldavsynchronizer with the latest Microsoft 365 version (monthly channel) without any problem. Not sure on which version 2024 ltsc depends on...

kerem commented

2026-02-25 20:31:35 +03:00

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@Marerc commented on GitHub (Jul 24, 2024):

I am running caldavsynchronizer with the latest Microsoft 365 version (monthly channel) without any problem. Not sure on which version 2024 ltsc depends on...

Actually, I have no idea where the issue from, and there is no useful suggestion from the public internet.

@Marerc commented on GitHub (Jul 24, 2024): > I am running caldavsynchronizer with the latest Microsoft 365 version (monthly channel) without any problem. Not sure on which version 2024 ltsc depends on... Actually, I have no idea where the issue from, and there is no useful suggestion from the public internet.

kerem commented

2026-02-25 20:31:35 +03:00

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@usselite commented on GitHub (Sep 15, 2024):

@Marerc did you try https://stackoverflow.com/questions/24287717/clickonce-wont-run-getting-specified-cast-not-valid?
Also double check if you have .NET Framework 4.8 installed.

@usselite commented on GitHub (Sep 15, 2024): @Marerc did you try https://stackoverflow.com/questions/24287717/clickonce-wont-run-getting-specified-cast-not-valid? Also double check if you have .NET Framework 4.8 installed.