Consider presage upgrade path for v4

[kmcnaught]

Optikey v4 will be a 64 bit application, so users who have set up presage will need to upgrade to a 64 bit version

We will need to

• ensure documentation updated to reflect this, and to point at the correct 64-bit version to install
• test the presage upgrade path, can users keep their existing database/model?
• test the optikey upgrade path - if someone is set up to use 32 bit presage, make sure Optikey doesn't crash, gives a helpful error and falls back to another prediction method (or none)

[kmcnaught]

See PresageInstallationProblemsDetected - update to also check application bitness and give appropriate warning/log.

[kmcnaught]

@JuliusSweetland I was just looking at the previous checks for Presage install, and I found this suspicious looking if statement. I just wanted to sanity check it before ripping it out, in case I'm confused.

https://github.com/OptiKey/OptiKey/blob/c599992402e688e6f1f35e4a0d0acf42692b7d56/src/JuliusSweetland.OptiKey.Core/OptiKeyApp.cs#L200-L202

I believe the logic was intended to be "if the Presage install doesn't match the OS bitness then report a problem" but the checks in the if statement are the wrong way round, correct?

I think the logic should be "if the Presage install doesn't match the process bitness then report a problem".

I believe that if someone tried to run Optikey (classic) on a 32 bit machine, it would refuse to load Presage. The fact that most users have a 64 OS (running a 32 bit Optikey) means we've not hit this bug.

If you agree with my reading of the situation, I will fix this in master as well as upgrading the logic in v4

[JuliusSweetland]

I think those lines are correct and are testing the install location as a proxy for whether the user has presage 32 bit installed. On a 32 bit os the location will be "program files", while on a 64 bit os it will be "program files x86". Either test would fail if passage x64 was installed (although I'm not convinced it would be possible to install that on a 32 bit operating system).

On Mon, 16 Jan 2023, 12:46 kmcnaught, @.***> wrote:

@JuliusSweetland https://github.com/JuliusSweetland I was just looking at the previous checks for Presage install, and I found this suspicious looking if statement. I just wanted to sanity check it before ripping it out, in case I'm confused.

https://github.com/OptiKey/OptiKey/blob/c599992402e688e6f1f35e4a0d0acf42692b7d56/src/JuliusSweetland.OptiKey.Core/OptiKeyApp.cs#L200-L202

I believe the logic was intended to be "if the Presage install doesn't match the OS bitness then report a problem" but the checks in the if statement are the wrong way round, correct?

I think the logic should be "if the Presage install doesn't match the process bitness then report a problem".

I believe that if someone tried to run Optikey (classic) on a 32 bit machine, it would refuse to load Presage. The fact that most users have a 64 OS (running a 32 bit Optikey) means we've not hit this bug.

If you agree with my reading of the situation, I will fix this in master as well as upgrading the logic in v4

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[kmcnaught]

Oh I see, these checks implicitly assume that it's a 32 bit version of presage installed. Since I have a 64 bit OS I get 32 bit programs installed in Program Files (x86) and 64 bit ones in Program Files so I thought it was a proxy for which (32/64) Presage version was installed. I hadn't realised 32 bit Windows only had Program Files although it makes sense in retrospect! What a confusing naming system!

We will need to check OS bitness and process bitness against install location to check for compatibility now that Optikey can be a 32 or 64 bit process